tools build: Add feature test for libelf with ZSTD

The macro ELFCOMPRESS_ZSTD defines the compress algorithm, which was
introduced in the commit ("libelf: Document and make ELFCOMPRESS_ZSTD
usable with old system elf.h") of the repository elfutils-0.188-67.
Therefore, libelf 0.189 and later versions require to link the libzstd
library.

Add a test for checking if libelf supports ZSTD algorithm. Pass the
macro ELFCOMPRESS_ZSTD as an argument to the elf_compress() function.
If the build succeeds, it means the feature is supported.

Reviewed-by: Quentin Monnet <[e-mail]>
Signed-off-by: Leo Yan <[e-mail]>
Tested-by: Namhyung Kim <[e-mail]>
Tested-by: Quentin Monnet <[e-mail]>
Acked-by: Andrii Nakryiko <[e-mail]>
Acked-by: Jiri Olsa <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexei Starovoitov <[e-mail]>
Cc: Daniel Borkmann <[e-mail]>
Cc: Eduard Zingerman <[e-mail]>
Cc: Guilherme Amadio <[e-mail]>
Cc: Hao Luo <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: James Clark <[e-mail]>
Cc: John Fastabend <[e-mail]>
Cc: KP Singh <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Martin KaFai Lau <[e-mail]>
Cc: Nick Terrell <[e-mail]>
Cc: Song Liu <[e-mail]>
Cc: Stanislav Fomichev <[e-mail]>
Cc: Yonghong Song <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/build/Makefile.feature

···
         libelf-getphdrnum               \
         libelf-gelf_getnote             \
         libelf-getshdrstrndx            \
+        libelf-zstd                     \
         libnuma                         \
         numa_num_possible_cpus          \
         libperl                         \

tools/build/feature/Makefile

···
          test-libelf-getphdrnum.bin             \
          test-libelf-gelf_getnote.bin           \
          test-libelf-getshdrstrndx.bin          \
+         test-libelf-zstd.bin                   \
          test-libdebuginfod.bin                 \
          test-libnuma.bin                       \
          test-numa_num_possible_cpus.bin        \
···
 
 $(OUTPUT)test-libelf-getshdrstrndx.bin:
 	$(BUILD) -lelf
+
+$(OUTPUT)test-libelf-zstd.bin:
+	$(BUILD) -lelf -lz -lzstd
 
 $(OUTPUT)test-libdebuginfod.bin:
 	$(BUILD) -ldebuginfod

tools/build/feature/test-all.c

···
 # include "test-libelf-getshdrstrndx.c"
 #undef main
 
+#define main main_test_libelf_zstd
+# include "test-libelf-zstd.c"
+#undef main
+
 #define main main_test_libslang
 # include "test-libslang.c"
 #undef main

tools/build/feature/test-libelf-zstd.c

···
+// SPDX-License-Identifier: GPL-2.0
+#include <stddef.h>
+#include <libelf.h>
+
+int main(void)
+{
+	elf_compress(NULL, ELFCOMPRESS_ZSTD, 0);
+	return 0;
+}