perf tools: Fix test build error when bindir contains double slash

When building with a prefix ending with a slash, for example:

	$ make prefix=/usr/local/

one of the perf tests fail to compile due to BUILD_STR macro mishandling
bindir_SQ string containing with two slashes:

	-DBINDIR="BUILD_STR(/usr/local//bin)"

with the following error:

	  CC       tests/attr.o
	tests/attr.c: In function ‘test__attr’:
	tests/attr.c:168:50: error: expected ‘)’ before ‘;’ token
	  snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR);
                                                  ^
	tests/attr.c:176:1: error: expected ‘;’ before ‘}’ token
	 }
	 ^
	tests/attr.c:176:1: error: control reaches end of non-void function [-Werror=return-type]
	 }
	 ^
	cc1: all warnings being treated as errors

This patch works around the problem by "cleaning" the bindir string
using make's abspath function.

Signed-off-by: Pawel Moll <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

tools/perf/config/Makefile

@@ -638,7 +638,7 @@ ifndef DESTDIR
 prefix ?= $(HOME)
 endif
 bindir_relative = bin
-bindir = $(prefix)/$(bindir_relative)
+bindir = $(abspath $(prefix)/$(bindir_relative))
 mandir = share/man
 infodir = share/info
 perfexecdir = libexec/perf-core