patch 8.1.0050: $VIM_TERMINAL is also set when not in a terminal window
Problem: $VIM_TERMINAL is also set when not in a terminal window.
Solution: Pass a flag to indicate whether the job runs in a terminal.
diff --git a/src/proto/os_unix.pro b/src/proto/os_unix.pro
index 5d90c0e..262a8d5 100644
--- a/src/proto/os_unix.pro
+++ b/src/proto/os_unix.pro
@@ -62,7 +62,7 @@
void mch_new_shellsize(void);
void may_send_sigint(int c, pid_t pid, pid_t wpid);
int mch_call_shell(char_u *cmd, int options);
-void mch_job_start(char **argv, job_T *job, jobopt_T *options);
+void mch_job_start(char **argv, job_T *job, jobopt_T *options, int is_terminal);
char *mch_job_status(job_T *job);
job_T *mch_detect_ended_job(job_T *job_list);
int mch_signal_job(job_T *job, char_u *how);