Unify MAX/MIN definitions (in ink_defs.h). Also clean up the checks of
gcc prior to v3.x (which we no long support).
TS-1169 Eliminate bogus asserts. Credits to Conan Wang.
TS-1764 Unify MAX/MIN definitions (in ink_defs.h). Also clean up the checks of gcc prior to v3.x (which we no longer support.