these linker flags apply to both cygwin and mingw32

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89369 65c4cc65-6c06-0410-ace0-fbb531ad65f3

Makefile

@@ -277,7 +277,7 @@ ifeq ($(OSARCH),SunOS)
   SOLINK=-shared -fpic -L/usr/local/ssl/lib
 endif
 
-ifeq ($(OSARCH),mingw32)
+ifneq ($(findstring $(OSARCH), mingw32 cygwin ),)
   SOLINK=-Xlinker -r
 endif