[ELF commit] Add new zstd compression algorithm

[Cary Coutant]

In the gABI group, we have approved the addition of a new compression
type, using the zstd library (zstandard.org). I'm about to commit this
patch to add the new value to <elf/common.h>.

https://groups.google.com/g/generic-abi/c/satyPkuMisk/m/dP2pPh9mAwAJ

-cary


include/elf/
        * common.h: Add ELFCOMPRESS_ZSTD.


diff --git a/include/elf/common.h b/include/elf/common.h
index e4bc53e35b4..ebcd8f9e82c 100644
--- a/include/elf/common.h
+++ b/include/elf/common.h
@@ -588,6 +588,8 @@

 /* Compression types.  */
 #define ELFCOMPRESS_ZLIB   1           /* Compressed with zlib.  */
+#define ELFCOMPRESS_ZSTD   2           /* Compressed with zstd  */
+                                       /* (see http://www.zstandard.org). */
 #define ELFCOMPRESS_LOOS   0x60000000  /* OS-specific semantics, lo */
 #define ELFCOMPRESS_HIOS   0x6FFFFFFF  /* OS-specific semantics, hi */
 #define ELFCOMPRESS_LOPROC 0x70000000  /* Processor-specific semantics, lo */