Fixed path converting with non ascii char.

When a non ascii char is at the beginning of a path the current conversion
destroys the path. This fix will prevent this with an extra check for
non-ascii UTF-8 characters.

Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: 마누엘 <nalla@hamal.uberspace.de>

winsup/cygwin/msys2_path_conv.cc

@@ -390,7 +390,7 @@ path_type find_path_start_and_type(const char** src, int recurse, const char* en
     }
     it = *src;
 
-    while (!isalnum(*it) && *it != '/' && *it != '\\' && *it != ':' && *it != '-' && *it != '.') {
+    while (!isalnum(*it) && !(0x80 & *it) && *it != '/' && *it != '\\' && *it != ':' && *it != '-' && *it != '.') {
         recurse = true;
         it = ++*src;
         if (it == end || *it == '\0') return NONE;