Update OS X header to point to SDK

Signed-off-by: Stephen Celis <stephen@stephencelis.com>

sqlite3/macosx.modulemap

@@ -1,4 +1,4 @@
 module sqlite3 [system] {
-    header "/usr/include/sqlite3.h"
+    header "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/sqlite3.h"
     export *
 }