* environ.cc: Add TMPDIR to the list of environment variables which are

converted to POSIX format.
* sigproc.cc (proc_terminate): Don't attempt to delete when a muto pointer is
NULL.

winsup/cygwin/environ.cc

@@ -41,6 +41,8 @@ static win_env conv_envvars[] =
      return_MAX_PATH, return_MAX_PATH},
     {"LD_LIBRARY_PATH=", 16, NULL, NULL, cygwin_conv_to_full_posix_path,
      cygwin_conv_to_full_win32_path, return_MAX_PATH, return_MAX_PATH},
+    {"TMPDIR=", 7, NULL, NULL, cygwin_conv_to_full_posix_path, cygwin_conv_to_full_win32_path,
+     return_MAX_PATH, return_MAX_PATH},
     {NULL, 0, NULL, NULL, NULL, NULL, 0, 0}
   };