patch 9.1.1307: make syntax does not reliably detect different flavors

Problem:  GNU extensions, such as `ifeq` and `wildcard` function, are
          highlighted in BSDmakefile
Solution: detect BSD, GNU, or Microsoft implementation according to
	  filename, user-defined global variables, or file contents

closes: #17089

Co-authored-by: Roland Hieber <rohieb@users.noreply.github.com>
Signed-off-by: Eisuke Kawashima <e-kwsm@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1307,
 /**/
     1306,
 /**/