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)
diff --git a/src/GvimExt/Make_ming.mak b/src/GvimExt/Make_ming.mak
index a6ab3ae..8d17142 100644
--- a/src/GvimExt/Make_ming.mak
+++ b/src/GvimExt/Make_ming.mak
@@ -49,8 +49,8 @@
 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
diff --git a/src/Make_cyg_ming.mak b/src/Make_cyg_ming.mak
index b6dd928..8895d27 100644
--- a/src/Make_cyg_ming.mak
+++ b/src/Make_cyg_ming.mak
@@ -220,7 +220,6 @@
 else
 WINDRES := windres
 endif
-WINDRES_CC = $(CC)
 
 # Get the default ARCH.
 ifndef ARCH
@@ -514,7 +513,8 @@
 
 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
diff --git a/src/version.c b/src/version.c
index 0602b9d..dce32e7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2408,
+/**/
     2407,
 /**/
     2406,