Add LDFLAGS variable to Makefile so that extra linker flags can be sent via this variable.

Upstream-Status: Pending

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>

diff --git a/Makefile b/Makefile
index 49d622d..cd17334 100644
--- a/Makefile
+++ b/Makefile
@@ -48,18 +48,17 @@ CFLAGS = -Wall -W -O2
 CFLAGS_lib = $(CFLAGS) -fPIC
 CFLAGS_bin = $(CFLAGS) -fomit-frame-pointer
 
-LDFLAGS =
 LDFLAGS_shared = --shared
 LDFLAGS_shared_LINUX = --shared
 LDFLAGS_shared_SUN = -G
 LDFLAGS_shared_HP = -b
 LDFLAGS_lib = $(LDFLAGS_shared)
-LDFLAGS_lib_LINUX = $(LDFLAGS_shared_LINUX) \
+LDFLAGS_lib_LINUX = $(LDFLAGS) $(LDFLAGS_shared_LINUX) \
 	-Wl,--soname,$(SHARED_LIB),--version-script,$(MAP_LIB)
 LDFLAGS_lib_SUN = $(LDFLAGS_shared_SUN)
 LDFLAGS_lib_HP = $(LDFLAGS_shared_HP)
 LDFLAGS_pam = $(LDFLAGS_shared)
-LDFLAGS_pam_LINUX = $(LDFLAGS_shared_LINUX) \
+LDFLAGS_pam_LINUX = $(LDFLAGS) $(LDFLAGS_shared_LINUX) \
 	-Wl,--version-script,$(MAP_PAM)
 LDFLAGS_pam_SUN = $(LDFLAGS_shared_SUN)
 LDFLAGS_pam_HP = $(LDFLAGS_shared_HP)