Respect user LDFLAGS

http://bugs.gentoo.org/126825

--- include/buildmacros
+++ include/buildmacros
@@ -9,7 +9,8 @@
 # $(CXXFILES), or $(HFILES) and is used to construct the manifest list
 # during the "dist" phase (packaging).
 
-LDFLAGS = $(LLDFLAGS)
+LDFLAGS += $(LDFLAGS_OPT) $(LLDFLAGS)
+LTLDFLAGS += $(LDFLAGS_OPT)
 LDLIBS = $(LLDLIBS) $(PLDLIBS) $(MALLOCLIB)
 
 MAKEOPTS = --no-print-directory
--- include/builddefs.in
+++ include/builddefs.in
@@ -9,6 +9,7 @@
 
 DEBUG = @debug_build@
 OPTIMIZER = @opt_build@
+LDFLAGS_OPT = @LDFLAGS@
 MALLOCLIB = @malloc_lib@
 
 LIBATTR = $(TOPDIR)/libattr/libattr.la