updated for version 7.3.012
Problem:    Problems building with MingW.
Solution:   Adjust the MingW makefiles. (Jon)
diff --git a/src/GvimExt/Make_ming.mak b/src/GvimExt/Make_ming.mak
index 5997e7e..f7265e9 100644
--- a/src/GvimExt/Make_ming.mak
+++ b/src/GvimExt/Make_ming.mak
@@ -33,7 +33,7 @@
 endif
 endif
 CXX := $(CROSS_COMPILE)g++
-WINDRES := $(CROSS_COMPILE)windres
+WINDRES := $(CROSS_COMPILE)windres --preprocessor="$(CXX) -E -xc" -
 LIBS :=  -luuid
 RES  := gvimext.res
 DEFFILE = gvimext_ming.def