WebPMemToUint32: remove ptr cast to int
WebPMemToUint32: remove ptr cast to int

this can result in an alignment hint on arm causing a SIGBUS. casting
the input ptr to anything aside from its type is unnecessary for memcpy
and is contrary to the intent of this function.

Change-Id: I9a4d3f4be90f80cd8c3e96ccbe557e51e34cf7a5

PKRoma/libwebp,PKRoma/libwebp,PKRoma/libwebp,PKRoma/libwebp,PKRoma/libwebp,PKRoma/libwebp,webmproject/libwebp,webmproject/libwebp,webmproject/libwebp,webmproject/libwebp,webmproject/libwebp