Only replace backslashes with forwards slashes on Windows because backslashes are valid in Linux paths.

Author: bartecargo

context.cpp

@@ -281,7 +281,9 @@ namespace Sass {
     char wd[wd_len];
     string cwd = getcwd(wd, wd_len);
     if (cwd[cwd.length() - 1] != '/') cwd += '/';
+#ifdef _WIN32
     replace(begin(cwd), end(cwd), '\\', '/');    //convert Windows backslashes to URL forward slashes
+#endif
     return cwd;
   }