perf build: Remove unused HAVE_GLIBC_SUPPORT

HAVE_GLIBC_SUPPORT is only used in `perf version --build-options` but
doesn't control any behavior. Remove from the build to simplify it.
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Martin Liška <mliska@suse.cz>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Pavithra Gurushankar <gpavithrasha@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Monnet <quentin@isovalent.com>
Cc: Roberto Sassu <roberto.sassu@huawei.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
Cc: Tom Rix <trix@redhat.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Cc: llvm@lists.linux.dev
Link: https://lore.kernel.org/r/20230311065753.3012826-2-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Makefile.config

@@ -476,10 +476,6 @@ else
   endif # libelf support
 endif # NO_LIBELF
 
-ifeq ($(feature-glibc), 1)
-  CFLAGS += -DHAVE_GLIBC_SUPPORT
-endif
-
 ifeq ($(feature-libaio), 1)
   ifndef NO_AIO
     CFLAGS += -DHAVE_AIO_SUPPORT

tools/perf/builtin-version.c

@@ -59,7 +59,6 @@ static void library_status(void)
 {
 	STATUS(HAVE_DWARF_SUPPORT, dwarf);
 	STATUS(HAVE_DWARF_GETLOCATIONS_SUPPORT, dwarf_getlocations);
-	STATUS(HAVE_GLIBC_SUPPORT, glibc);
 #ifndef HAVE_SYSCALL_TABLE_SUPPORT
 	STATUS(HAVE_LIBAUDIT_SUPPORT, libaudit);
 #endif