tests: also install tests app

Upstream-Status: Inappropriate [configuration]

Signed-off-by: Yu Ke <ke.yu@intel.com>

Index: libdrm-2.4.66/tests/Makefile.am
===================================================================
--- libdrm-2.4.66.orig/tests/Makefile.am
+++ libdrm-2.4.66/tests/Makefile.am
@@ -73,3 +73,4 @@ TESTS +=					\
 endif
 
 check_PROGRAMS += $(TESTS)
+bin_PROGRAMS = $(check_PROGRAMS)