Windows build fix: strncasecmp is a POSIX call

[DennisOSRM]

Windows is as always a treat. This time, the str(n)casecmp are available under a different name only. The following diff fixes compilation.

diff --git a/third_party/osmium/util/config.hpp b/third_party/osmium/util/config.hpp
index c30f02e..6c86d68 100644
--- a/third_party/osmium/util/config.hpp
+++ b/third_party/osmium/util/config.hpp
@@ -36,6 +36,11 @@ DEALINGS IN THE SOFTWARE.
 #include <cstdlib>
 #include <cstring>

+#ifdef _MSC_VER 
+#define strncasecmp _strnicmp
+#define strcasecmp _stricmp
+#endif
+
 namespace osmium {

     namespace config {