patch 7.4.1637

Problem:    Can't build with older MinGW compiler.
Solution:   Change option from c++11 to gnu++11. (Ken Takata)

Author: brammool

src/Make_cyg_ming.mak

@@ -415,7 +415,7 @@ WINDRES_CC = $(CC)
 ###########################################################################
 
 CFLAGS = -Iproto $(DEFINES) -pipe -march=$(ARCH) -Wall
-CXXFLAGS = -std=c++11
+CXXFLAGS = -std=gnu++11
 WINDRES_FLAGS = --preprocessor="$(WINDRES_CC) -E -xc" -DRC_INVOKED
 EXTRA_LIBS =
 

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1637,
 /**/
     1636,
 /**/