Add support for $(cflags-lib-y)

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Pascal Brand <pascal.brand@linaro.org>
Tested-by: Pascal Brand <pascal.brand@linaro.org> (STM platform)
diff --git a/mk/compile.mk b/mk/compile.mk
index b4e7e31..2b7f8e2 100644
--- a/mk/compile.mk
+++ b/mk/compile.mk
@@ -66,7 +66,7 @@
 			      $$(cflags-remove-$2), \
 		   $$(CFLAGS) $$(CFLAGS_WARNS) \
 		   $$(comp-cflags$$(comp-sm-$2)) $$(cflags$$(comp-sm-$2)) \
-		   $$(cflags-$2))
+		   $$(cflags-lib$$(comp-lib-$2)) $$(cflags-$2))
 else ifeq ($$(filter %.S,$1),$1)
 comp-flags-$2 = -DASM=1 $$(filter-out $$(AFLAGS_REMOVE) $$(aflags-remove) \
 				      $$(aflags-remove-$2), \