tools build: Remove get_current_dir_name feature check

As perf no longer tests for this feature, and it was the only user,
remove the feature test.

Signed-off-by: Ian Rogers <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
[ Remove the call to main_test_get_current_dir_name() from main() in test-all.c, otherwise it will always fail ]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/build/Makefile.feature

···
         libdw                           \
         eventfd                         \
         fortify-source                  \
-        get_current_dir_name            \
         gettid				\
         glibc                           \
         libbfd                          \

tools/build/feature/Makefile

···
          test-libdw.bin                         \
          test-eventfd.bin                       \
          test-fortify-source.bin                \
-         test-get_current_dir_name.bin          \
          test-glibc.bin                         \
          test-gtk2.bin                          \
          test-gtk2-infobar.bin                  \
···
 	$(BUILD) -lelf
 
 $(OUTPUT)test-eventfd.bin:
-	$(BUILD)
-
-$(OUTPUT)test-get_current_dir_name.bin:
 	$(BUILD)
 
 $(OUTPUT)test-glibc.bin:

tools/build/feature/test-all.c

···
 # include "test-libelf.c"
 #undef main
 
-#define main main_test_get_current_dir_name
-# include "test-get_current_dir_name.c"
-#undef main
-
 #define main main_test_gettid
 # include "test-gettid.c"
 #undef main
···
 	main_test_libpython();
 	main_test_hello();
 	main_test_libelf();
-	main_test_get_current_dir_name();
 	main_test_gettid();
 	main_test_glibc();
 	main_test_libdw();

tools/build/feature/test-get_current_dir_name.c

···
-// SPDX-License-Identifier: GPL-2.0
-#define _GNU_SOURCE
-#include <unistd.h>
-#include <stdlib.h>
-
-int main(void)
-{
-	free(get_current_dir_name());
-	return 0;
-}
-#undef _GNU_SOURCE