Use system app-arch/brotli instead of the bundled copy.

Bug: https://bugs.gentoo.org/984841
--- a/extension/parquet/CMakeLists.txt
+++ b/extension/parquet/CMakeLists.txt
@@ -8,8 +8,11 @@
 
 include_directories(
   include ../../third_party/lz4 ../../third_party/parquet
-  ../../third_party/thrift ../../third_party/snappy
-  ../../third_party/brotli/include)
+  ../../third_party/thrift ../../third_party/snappy)
+
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(BROTLI REQUIRED libbrotlienc libbrotlidec)
+include_directories(${BROTLI_INCLUDE_DIRS})
 
 add_subdirectory(decoder)
 add_subdirectory(reader)
@@ -51,44 +54,11 @@
   # lz4
   set(PARQUET_EXTENSION_FILES ${PARQUET_EXTENSION_FILES}
                               ../../third_party/lz4/lz4.cpp)
-  # brotli
-  set(PARQUET_EXTENSION_FILES
-      ${PARQUET_EXTENSION_FILES}
-      ../../third_party/brotli/enc/dictionary_hash.cpp
-      ../../third_party/brotli/enc/backward_references_hq.cpp
-      ../../third_party/brotli/enc/histogram.cpp
-      ../../third_party/brotli/enc/memory.cpp
-      ../../third_party/brotli/enc/entropy_encode.cpp
-      ../../third_party/brotli/enc/compound_dictionary.cpp
-      ../../third_party/brotli/enc/compress_fragment_two_pass.cpp
-      ../../third_party/brotli/enc/block_splitter.cpp
-      ../../third_party/brotli/enc/command.cpp
-      ../../third_party/brotli/enc/encode.cpp
-      ../../third_party/brotli/enc/encoder_dict.cpp
-      ../../third_party/brotli/enc/cluster.cpp
-      ../../third_party/brotli/enc/backward_references.cpp
-      ../../third_party/brotli/enc/utf8_util.cpp
-      ../../third_party/brotli/enc/compress_fragment.cpp
-      ../../third_party/brotli/enc/fast_log.cpp
-      ../../third_party/brotli/enc/brotli_bit_stream.cpp
-      ../../third_party/brotli/enc/bit_cost.cpp
-      ../../third_party/brotli/enc/static_dict.cpp
-      ../../third_party/brotli/enc/literal_cost.cpp
-      ../../third_party/brotli/enc/metablock.cpp
-      ../../third_party/brotli/common/dictionary.cpp
-      ../../third_party/brotli/common/constants.cpp
-      ../../third_party/brotli/common/transform.cpp
-      ../../third_party/brotli/common/platform.cpp
-      ../../third_party/brotli/common/shared_dictionary.cpp
-      ../../third_party/brotli/common/context.cpp
-      ../../third_party/brotli/dec/state.cpp
-      ../../third_party/brotli/dec/decode.cpp
-      ../../third_party/brotli/dec/huffman.cpp
-      ../../third_party/brotli/dec/bit_reader.cpp)
 endif()
 
 build_extension_library(parquet ${PARQUET_EXTENSION_FILES})
 target_link_libraries(parquet_loadable_extension duckdb_mbedtls duckdb_zstd)
+target_link_libraries(parquet_extension ${BROTLI_LIBRARIES})
 
 install(
   TARGETS parquet_extension
--- a/extension/parquet/column_reader.cpp
+++ b/extension/parquet/column_reader.cpp
@@ -650,18 +650,18 @@
 		break;
 	}
 	case CompressionCodec::BROTLI: {
-		auto state = duckdb_brotli::BrotliDecoderCreateInstance(nullptr, nullptr, nullptr);
+		auto state = BrotliDecoderCreateInstance(nullptr, nullptr, nullptr);
 		size_t total_out = 0;
 		auto src_size_size_t = NumericCast<size_t>(src_size);
 		auto dst_size_size_t = NumericCast<size_t>(dst_size);
 
-		auto res = duckdb_brotli::BrotliDecoderDecompressStream(state, &src_size_size_t, &src, &dst_size_size_t, &dst,
+		auto res = BrotliDecoderDecompressStream(state, &src_size_size_t, &src, &dst_size_size_t, &dst,
 		                                                        &total_out);
-		if (res != duckdb_brotli::BROTLI_DECODER_RESULT_SUCCESS) {
+		if (res != BROTLI_DECODER_RESULT_SUCCESS) {
 			throw InvalidInputException("Failed to read file \"%s\": Brotli Decompression failure",
 			                            Reader().GetFileName());
 		}
-		duckdb_brotli::BrotliDecoderDestroyInstance(state);
+		BrotliDecoderDestroyInstance(state);
 		break;
 	}
 
--- a/extension/parquet/column_writer.cpp
+++ b/extension/parquet/column_writer.cpp
@@ -214,9 +214,9 @@
 		break;
 	}
 	case CompressionCodec::BROTLI: {
-		compressed_size = duckdb_brotli::BrotliEncoderMaxCompressedSize(temp_writer.GetPosition());
+		compressed_size = BrotliEncoderMaxCompressedSize(temp_writer.GetPosition());
 		compressed_buf = BufferAllocator::Get(writer.GetContext()).Allocate(compressed_size);
-		duckdb_brotli::BrotliEncoderCompress(BROTLI_DEFAULT_QUALITY, BROTLI_DEFAULT_WINDOW, BROTLI_DEFAULT_MODE,
+		BrotliEncoderCompress(BROTLI_DEFAULT_QUALITY, BROTLI_DEFAULT_WINDOW, BROTLI_DEFAULT_MODE,
 		                                     temp_writer.GetPosition(), temp_writer.GetData(), &compressed_size,
 		                                     compressed_buf.get());
 		compressed_data = compressed_buf.get();