* Build.com: Compile jamgram.c with /NOOPTIMIZE.
The V7.2-021 cxx compiler on VMS8.2/IA64 has trouble with the parser
produced by either (b)yacc or bison: when jamgram.c is compiled with
optimization levels at or above /OPTIMIZE=(LEVEL=2), jam.exe crashes
as soon as it begins to parse its internal copy of Jambase. (The
default optmization level is /OPTIMIZE=(LEVEL=4), by the way.)
* Build.com: Display commands in build.com as they are executed, since
there is no other progress notification.
* Jambase ($(VMS)): Remove special cases for OS=OPENVMS and OS=VMS;
Newer compilers do not accept "vaxc" as a C dialect, and vaxcrtl.olb
does not exist on IA64.
There is no real difference between VMS and OPENVMS; the latter is
just marketingspeak. Having both OS=VMS and OS=OPENVMS switches is
probably more confusing than helpful; if in the future these flags
need to be restored, consider using some combination of OSPLAT and/or
OSVER also.