perf build: Add feature check for dwarf_getcfi()

The dwarf_getcfi() is available on libdw 0.142+. Instead of just
checking the version number, it'd be nice to have a config item to check
the feature at build time.

Suggested-by: Masami Hiramatsu (Google) <[e-mail]>
Signed-off-by: Namhyung Kim <[e-mail]>
Acked-by: Masami Hiramatsu (Google) <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/build/Makefile.feature

···
         backtrace                       \
         dwarf                           \
         dwarf_getlocations              \
+        dwarf_getcfi                    \
         eventfd                         \
         fortify-source                  \
         get_current_dir_name            \

tools/build/feature/Makefile

···
          test-bionic.bin                        \
          test-dwarf.bin                         \
          test-dwarf_getlocations.bin            \
+         test-dwarf_getcfi.bin                  \
          test-eventfd.bin                       \
          test-fortify-source.bin                \
          test-get_current_dir_name.bin          \
···
 	$(BUILD) $(DWARFLIBS)
 
 $(OUTPUT)test-dwarf_getlocations.bin:
+	$(BUILD) $(DWARFLIBS)
+
+$(OUTPUT)test-dwarf_getcfi.bin:
 	$(BUILD) $(DWARFLIBS)
 
 $(OUTPUT)test-libelf-getphdrnum.bin:

tools/build/feature/test-dwarf_getcfi.c

···
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <elfutils/libdw.h>
+
+int main(void)
+{
+	Dwarf *dwarf = NULL;
+	return dwarf_getcfi(dwarf) == NULL;
+}