gstdint.h installs a header file, "gstdint.h", that
will "#include" the "stdint.h" or "inttypes.h" header
file of the local system - if one of these exists.
Otherwise the bitsizes of basic types are detected
for the local libc/compiler pair, and the C96
inttypes typedefs are generated into "gstdint.h".
