tools/perf/build: Harmonize the style of the feature testcases

The various testcases used different styles, which was not really
visible as long as they hid in feature-tests.mak. Now that they
are out in the open make them prettier.

( Also delete the leftover, empty feature-tests.mak file. )

Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/n/tip-drDWk8xltndjdsespzjbhu6w@git.kernel.orgSigned-off-by: Ingo Molnar <mingo@kernel.org>

tools/perf/config/feature-checks/test-backtrace.c

@@ -11,4 +11,3 @@ int main(void)
 
 	return 0;
 }
-

tools/perf/config/feature-checks/test-cplus-demangle.c

@@ -12,4 +12,3 @@ int main(void)
 
 	return 0;
 }
-

tools/perf/config/feature-checks/test-dwarf.c

@@ -5,5 +5,6 @@
 int main(void)
 {
 	Dwarf *dbg = dwarf_begin(0, DWARF_C_READ);
+
 	return (long)dbg;
 }

tools/perf/config/feature-checks/test-glibc.c

@@ -3,6 +3,6 @@
 int main(void)
 {
 	const char *version = gnu_get_libc_version();
+
 	return (long)version;
 }
-

tools/perf/config/feature-checks/test-libaudit.c

@@ -5,5 +5,6 @@ extern int printf(const char *format, ...);
 int main(void)
 {
 	printf("error message: %s\n", audit_errno_to_name(0));
+
 	return audit_open();
 }

tools/perf/config/feature-checks/test-libbfd.c

@@ -13,4 +13,3 @@ int main(void)
 
 	return 0;
 }
-

tools/perf/config/feature-checks/test-libelf-getphdrnum.c

 #include <libelf.h>
-#
+
 int main(void)
 {
 	size_t dst;
+
 	return elf_getphdrnum(0, &dst);
 }

tools/perf/config/feature-checks/test-libelf-mmap.c

 #include <libelf.h>
-#
+
 int main(void)
 {
 	Elf *elf = elf_begin(0, ELF_C_READ_MMAP, 0);
+
 	return (long)elf;
 }

tools/perf/config/feature-checks/test-libelf.c

@@ -3,5 +3,6 @@
 int main(void)
 {
 	Elf *elf = elf_begin(0, ELF_C_READ, 0);
+
 	return (long)elf;
 }

tools/perf/config/feature-checks/test-libnuma.c

@@ -4,5 +4,6 @@
 int main(void)
 {
 	numa_available();
+
 	return 0;
 }

tools/perf/config/feature-checks/test-libpython.c

 #include <Python.h>
-#
+
 int main(void)
 {
 	Py_Initialize();
+
 	return 0;
 }

tools/perf/config/feature-tests.mak

-
-