tools/rtla: Use pkg-config in lib_setup of Makefile.config

This allows to build against libtraceevent and libtracefs installed
in non-standard locations.

Signed-off-by: Guilherme Amadio <[email protected]>
Tested-by: Thorsten Leemhuis <[email protected]>
Tested-by: Leo Yan <[email protected]>
Acked-by: Steven Rostedt (Google) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

Author: amadio

tools/tracing/rtla/Makefile.config

@@ -7,7 +7,8 @@ LIBTRACEFS_MIN_VERSION = 1.6
 
 define lib_setup
   $(eval LIB_INCLUDES += $(shell sh -c "$(PKG_CONFIG) --cflags lib$(1)"))
-  $(eval EXTLIBS += -l$(1))
+  $(eval LDFLAGS += $(shell sh -c "$(PKG_CONFIG) --libs-only-L lib$(1)"))
+  $(eval EXTLIBS += $(shell sh -c "$(PKG_CONFIG) --libs-only-l lib$(1)"))
 endef
 
 $(call feature_check,libtraceevent)