Bugzilla Bug 337887: use the -mnop-fun-dllimport flag so that we can use

a pointer to a function declared with the dllimport attribute as a constant
address.  We need to use such function pointers to initialize a const
structure in nss/lib/ssl/sslsock.c.  The patch is contributed by Chris
Seawood <cls@seawood.org>.  r=wtc.

security/coreconf/WIN32.mk

@@ -89,7 +89,10 @@ endif
 DLL_SUFFIX   = dll
 
 ifdef NS_USE_GCC
-    OS_CFLAGS += -mno-cygwin -mms-bitfields
+    # The -mnop-fun-dllimport flag allows us to avoid a drawback of
+    # the dllimport attribute that a pointer to a function marked as
+    # dllimport cannot be used as as a constant address.
+    OS_CFLAGS += -mno-cygwin -mms-bitfields -mnop-fun-dllimport
     _GEN_IMPORT_LIB=-Wl,--out-implib,$(IMPORT_LIBRARY)
     DLLFLAGS  += -mno-cygwin -o $@ -shared -Wl,--export-all-symbols $(if $(IMPORT_LIBRARY),$(_GEN_IMPORT_LIB))
     ifdef BUILD_OPT