build system: make CONFIG_EXTRA_LDFLAGS go to LDFLAGS, not EXTRA_LDFLAGS

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/Makefile.flags b/Makefile.flags
index 307afa7..a1ed148 100644
--- a/Makefile.flags
+++ b/Makefile.flags
@@ -163,7 +163,7 @@
 endif
 
 ifneq ($(CONFIG_EXTRA_LDFLAGS),)
-EXTRA_LDFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_LDFLAGS)))
+LDFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_LDFLAGS)))
 #"))
 endif