[PATCH] make-event-names.py: fix SYN_MAX definition for modern kernel headers

SYN_MAX has been exported to user space since 3.12 (52764fed5: Input: add
SYN_MAX and SYN_CNT constants), so only define it locally if not already
defined, otherwise the build breaks.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 src/make-event-names.py |    2 ++
 1 file changed, 2 insertions(+)

Index: evemu-1.2.0/src/make-event-names.py
===================================================================
--- evemu-1.2.0.orig/src/make-event-names.py
+++ evemu-1.2.0/src/make-event-names.py
@@ -91,7 +91,9 @@
 	print "#ifndef EVENT_NAMES_H"
 	print "#define EVENT_NAMES_H"
 	print ""
+	print "#ifndef SYN_MAX"
 	print "#define SYN_MAX 3 /* linux/input.h doesn't define that */"
+	print "#endif"
 	print ""
 
 	for prefix in prefixes: