Unix makefiles: Add option to disable optimizations and _FORTIFY_SOURCE

Some older compilers have problems compiling ACPICA with optimizations
(reportedly, gcc 4.4 for example). This change adds a command line
option for make (NOOPT) that disables all compiler optimizations and
the _FORTIFY_SOURCE compiler flag. The default optimization is -O2
with the _FORTIFY_SOURCE flag specified. ACPICA BZ 1034.
Lv Zheng, Bob Moore.