Enable format macros in glTFViewer
Enable format macros in glTFViewer

Without this compilation can fail in picojson.h because the PRId64 macro
isn't defined (it is used to print 64bit ints).

Kangz/nxt-standalone,googlearchive/nxt-standalone,Kangz/nxt-standalone,googlearchive/nxt-standalone,googlearchive/nxt-standalone,Kangz/nxt-standalone,Kangz/nxt-standalone,googlearchive/nxt-standalone