run-tests: print more information on unnecessary glob matching

Extend the message with the test name and the approximate line number. (The
line number is the one of the command producing the output.)
Finding the line to fix is easier now.

old message:
......
Info, unnecessary glob: at a/b/c (glob)
..

new message:
......
Info, unnecessary glob in test-example.t (after line 9): at a/b/c (glob)
..


The test result is still pass as before.

tests/run-tests.py

@@ -606,7 +606,7 b' def globmatch(el, l):'
     if el + '\n' == l:
         if os.altsep:
             # matching on "/" is not needed for this line
-            log("\nInfo, unnecessary glob: %s (glob)" % el)
+            return '-glob'
         return True
     i, n = 0, len(el)
     res = ''
@@ -797,7 +797,14 b' def tsttest(test, wd, options, replaceme'
             if isinstance(r, str):
                 if r == '+glob':
                     lout = el[:-1] + ' (glob)\n'
-                r = False
+                    r = False
+                elif r == '-glob':
+                    log('\ninfo, unnecessary glob in %s (after line %d):'
+                        ' %s (glob)\n' % (test, pos, el[-1]))
+                    r = True # pass on unnecessary glob
+                else:
+                    log('\ninfo, unknown linematch result: %r\n' % r)
+                    r = False
             if r:
                 postout.append("  " + el)
             else:

tests/test-run-tests.py

@@ -45,9 +45,7 b' def wintests():'
 
     direct matching, glob unnecessary
         >>> lm('g/b (glob)\n', 'g/b\n')
-        <BLANKLINE>
-        Info, unnecessary glob: g/b (glob)
-        True
+        'special: -glob'
 
     missing glob
         >>> lm('/g/c/d/fg\n', '\\g\\c\\d/fg\n')