[PATCH] gold: add --compress-debug-sections=zstd [PR 29641]

[Alan Modra]

Applied.
Fix the following:
compressed_output.cc:86:8: error: assignment of read-only variable ‘size’
   86 |   size = ZSTD_compress(*compressed_data + header_size, size, uncompressed_data,

diff --git a/gold/compressed_output.cc b/gold/compressed_output.cc
index e9f12241f26..f192ddb5080 100644
--- a/gold/compressed_output.cc
+++ b/gold/compressed_output.cc
@@ -81,7 +81,7 @@ zstd_compress(int header_size, const unsigned char *uncompressed_data,
 	      unsigned long uncompressed_size,
 	      unsigned char **compressed_data, unsigned long *compressed_size)
 {
-  const size_t size = ZSTD_compressBound(uncompressed_size);
+  size_t size = ZSTD_compressBound(uncompressed_size);
   *compressed_data = new unsigned char[size + header_size];
   size = ZSTD_compress(*compressed_data + header_size, size, uncompressed_data,
 		       uncompressed_size, ZSTD_CLEVEL_DEFAULT);

-- 
Alan Modra
Australia Development Lab, IBM