Ubuntu defaults to passing _FORTIFY_SOURCE=2 which breaks byacc as it doesn't
pass enough arguments to open():

 inlined from 'open_tmpfile' at byacc-20150711/main.c:588:5:
 /usr/include/x86_64-linux-gnu/bits/fcntl2.h:50:24: error: call to '__open_missing_mode' declared with attribute error:
 open with O_CREAT in second argument needs 3 arguments

Add a mode of 0666 to fix this.

Upstream-Status: Pending
Signed-off-by: Ross Burton <ross.burton@intel.com>

diff --git a/main.c b/main.c
index 620ce3f..82071a4 100644
--- a/main.c
+++ b/main.c
@@ -526,7 +526,7 @@ my_mkstemp(char *temp)
     }
     if ((name = tempnam(dname, fname)) != 0)
     {
-	fd = open(name, O_CREAT | O_EXCL | O_RDWR);
+      fd = open(name, O_CREAT | O_EXCL | O_RDWR, 0666);
 	strcpy(temp, name);
     }
     else