tests: quickly check if the glob line already matches the output

This happens when a path with "/" as only glob char is matched on a non windows
platform. (Currently one third of all glob matches.)
The slowdown on windows and the speedup on other os are neglectable.

tests/run-tests.py

@@ -541,6 +541,8 b' def rematch(el, l):'
 def globmatch(el, l):
     # The only supported special characters are * and ? plus / which also
     # matches \ on windows. Escaping of these caracters is supported.
+    if el + '\n' == l:
+        return True
     i, n = 0, len(el)
     res = ''
     while i < n: