Landing the rest of the win32 gmake changes:

* Adds Makefile.ins to win32 specific dirs
* Adds WINNT ifdefs to Makefile.ins
* Causes NSPR to be compiled with --with-mozilla
* Misc general Makefile.in cleanup

Bug #58981 r=mcafee

layout/inspector/src/Makefile.in

@@ -65,6 +65,16 @@ CPPSRCS= \
   inPNGEncoder.cpp \
 	$(NULL)
 
+ifeq ($(OS_ARCH),WINNT)
+DIRS		+= win
+endif
+
 FORCE_STATIC_LIB = 1
 
 include $(topsrcdir)/config/rules.mk
+
+DEFINES		+= -D_IMPL_NS_HTML
+
+ifeq ($(OS_ARCH),WINNT)
+DEFINES		+= -DWIN32_LEAN_AND_MEAN
+endif