patch 7.4.1306
Problem: Job control doesn't work well on MS-Windows.
Solution: Various fixes. (Ken Takata, Ozaki Kiichi , Yukihiro Nakadaira,
Yasuhiro Matsumoto)
diff --git a/src/proto/os_unix.pro b/src/proto/os_unix.pro
index bc250c8..c97f7fe 100644
--- a/src/proto/os_unix.pro
+++ b/src/proto/os_unix.pro
@@ -60,6 +60,7 @@
void mch_start_job(char **argv, job_T *job);
char *mch_job_status(job_T *job);
int mch_stop_job(job_T *job, char_u *how);
+void mch_clear_job(job_T *job);
void mch_breakcheck(void);
int mch_expandpath(garray_T *gap, char_u *path, int flags);
int mch_expand_wildcards(int num_pat, char_u **pat, int *num_file, char_u ***file, int flags);