Fix wrong INT64_MIN/MAX defines and naked preprocessor expansion

[BsAtHome]

Fix #3978.

• Inadvertent use of the wrong INT64_MIN/MAX defines instead of RTAPI_INT64_MIN/MAX.
• Fix naked __cplusplus preprocessor usage of that requires a defined() check.

[hdiethelm]

There is still an issue:

  Building modules, stage 2.
  MODPOST 219 modules
FATAL: modpost: GPL-incompatible module latencybinstream.ko uses GPL-only symbol 'hal_stream_depth'
make[2]: *** [scripts/Makefile.modpost:93: __modpost] Fehler 1

[BsAtHome]

Just force-pushed a fix for the "license" statement. I thought it was more intelligent than it was.

[hdiethelm]

It builds and works fine now. I tested in a VM.