bug in path handling

Hi folks,

I was unable to encode a track named:
"07 Medley: A. Kansas City B. Hey, Hey, Hey, Hey.wav"
because lame handle the colon as the drive separator in Windows.
This patch enables colon handling only under Windows.

Cheers,
Matteo Croce

--- a/frontend/parse.c	18 Feb 2012 13:09:00 -0000
+++ b/frontend/parse.c	7 Aug 2012 16:19:12 -0000
@@ -1200,14 +1200,18 @@
         for (; *s; ++s) {
             switch (*s) {
             case SLASH:
+#ifdef _WIN32
             case ':':
+#endif
                 s2 = s;
                 break;
             }
         }
+#ifdef _WIN32
         if (*s2 == ':') {
             ++s2;
         }
+#endif
     }
     if (a) {
         *a = s1;
@@ -1227,7 +1231,9 @@
         for (; *s; ++s) {
             switch (*s) {
             case SLASH:
+#ifdef _WIN32
             case ':':
+#endif
                 s1 = s2 = s;
                 break;
             case '.':
@@ -1238,7 +1244,11 @@
         if (s2 == s1) {
             s2 = s;
         }
-        if (*s1 == SLASH || *s1 == ':') {
+        if (*s1 == SLASH
+#ifdef _WIN32
+		|| *s1 == ':'
+#endif
+		) {
             ++s1;
         }
     }

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