Fix Savannah bug #31150 with failures due to setting window title.

* sub_proc.c (process_begin): Don't set startInfo.lpTitle, it
reportedly causes SV bug #31150, and according to MSDN it's a
no-no.
diff --git a/w32/subproc/sub_proc.c b/w32/subproc/sub_proc.c
index 9bbe3e5..dd0c1a4 100644
--- a/w32/subproc/sub_proc.c
+++ b/w32/subproc/sub_proc.c
@@ -756,7 +756,6 @@
 	startInfo.lpReserved = 0;
 	startInfo.cbReserved2 = 0;
 	startInfo.lpReserved2 = 0;
-	startInfo.lpTitle = shell_name ? shell_name : exec_path;
 	startInfo.hStdInput = (HANDLE)pproc->sv_stdin[1];
 	startInfo.hStdOutput = (HANDLE)pproc->sv_stdout[1];
 	startInfo.hStdError = (HANDLE)pproc->sv_stderr[1];