patch 8.2.2408: MinGW: "--preprocessor" flag no longer supported

Problem:    MinGW: "--preprocessor" flag no longer supported.
Solution:   Remove the flag, use the defaults. (Christopher Wellons,
            closes #7741)

src/GvimExt/Make_ming.mak

@@ -49,8 +49,8 @@ WINVER = 0x0501
 endif
 CXX := $(CROSS_COMPILE)g++
 WINDRES := $(CROSS_COMPILE)windres
-WINDRES_CXX = $(CXX)
-WINDRES_FLAGS = --preprocessor="$(WINDRES_CXX) -E -xc" -DRC_INVOKED
+# this used to have --preprocessor, but it's no longer supported
+WINDRES_FLAGS =
 LIBS :=  -luuid -lgdi32
 RES  := gvimext.res
 DEFFILE = gvimext_ming.def

src/Make_cyg_ming.mak

@@ -220,7 +220,6 @@ WINDRES := $(CROSS_COMPILE)windres
 else
 WINDRES := windres
 endif
-WINDRES_CC = $(CC)
 
 # Get the default ARCH.
 ifndef ARCH
@@ -514,7 +513,8 @@ endif
 
 CFLAGS = -I. -Iproto $(DEFINES) -pipe -march=$(ARCH) -Wall
 CXXFLAGS = -std=gnu++11
-WINDRES_FLAGS = --preprocessor="$(WINDRES_CC) -E -xc" -DRC_INVOKED
+# This used to have --preprocessor, but it's no longer supported
+WINDRES_FLAGS =
 EXTRA_LIBS =
 
 ifdef GETTEXT

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2408,
 /**/
     2407,
 /**/