benchmarks: Do not install to system-wide bin/

These benchmarks are first-and-foremost development tools, not aimed at
general users. As such they should not be installed into the system-wide
bin/ directory, but installed into libexec/.

v2: Now actually install beneath ${libexec}

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/benchmarks/Makefile.sources b/benchmarks/Makefile.sources
index 8f32404..3dc0263 100644
--- a/benchmarks/Makefile.sources
+++ b/benchmarks/Makefile.sources
@@ -1,4 +1,6 @@
-bin_PROGRAMS =                          \
+benchmarksdir=$(libexecdir)/intel-gpu-tools/benchmarks
+
+benchmarks_PROGRAMS =			\
 	intel_upload_blit_large         \
 	intel_upload_blit_large_gtt     \
 	intel_upload_blit_large_map     \