win32: code shrink character class detection

Add a routine to detect the names of character classes.  Use it
in fnmatch(3) and regcomp(3), replacing local code in the former.

Saves 216 bytes.

1 files changed, 7 insertions, 0 deletions

diff --git a/win32/match_class.c b/win32/match_class.c
new file mode 100644
index 000000000..789e0df02
--- /dev/null
+++ b/win32/match_class.c
@@ -0,0 +1,7 @@
+#include "libbb.h"
+#include "match_class.h"
+
+int match_class(const char *name)
+{
+        return index_in_strings(CHAR_CLASSES, name);
+}