Respect LDFLAGS

http://bugs.gentoo.org/333873
https://sourceforge.net/tracker/?func=detail&aid=3050710&group_id=36234&atid=416803

--- lib/Makefile.in
+++ lib/Makefile.in
@@ -248,7 +248,7 @@
 
 $(LIBGRETL): .deps $(LOBJS) $(AUX_LOBJ)
 	$(LDECHO)
-	$(AMP)$(LIBTOOL) --mode=link $(CCV) -o $@ $(LOBJS) $(AUX_LOBJ) \
+	$(AMP)$(LIBTOOL) --mode=link $(CCV) $(LDFLAGS) -o $@ $(LOBJS) $(AUX_LOBJ) \
 	-rpath $(RPATH) $(LIBS) -version-info $(CURRENT):$(REVISION):$(AGE)
 
 .deps:
--- plugin/Makefile.in
+++ plugin/Makefile.in
@@ -54,10 +54,10 @@
   CCECHO = @echo "  CC    $@"
   LDECHO = @echo "  LD    $@" 
   CCV = $(CC) > /dev/null
-  LINK = $(LDECHO); $(LIBTOOL) --mode=link $(CCV) -module -avoid-version -rpath $(plugindir)
+  LINK = $(LDECHO); $(LIBTOOL) --mode=link $(CCV) $(LDFLAGS) -module -avoid-version -rpath $(plugindir)
 else
   CCV = $(CC)
-  LINK = $(LIBTOOL) --mode=link $(CC) -module -avoid-version -rpath $(plugindir)
+  LINK = $(LIBTOOL) --mode=link $(CC) $(LDFLAGS) -module -avoid-version -rpath $(plugindir)
 endif
 
 GRETLINC = -I$(topsrc)/lib/src