Added explicit calls to fstream::close rather than relying on destructors as a tentative gcc-cygwin fix.

[SVN r21287]

libs/regex

@@ -1 +1 @@
-Subproject commit 7858e47a262e894e1eeeb0d1de7d8d9ea90ae78e
+Subproject commit 2c3ff62e1b6ab1bba1ec858c2adf3c4459a92bb1