This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.
Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.
The filenames in SRCS must have one of the extensions .s, .S, .c, or .cc
if they are to be handled by bsd.dep.mk. Lex and yacc files must be
converted to C files and kept around for everything to work. This is
handled fairly automatically if the names of the generated C files are
put in SRCS. Unfortunately these names must be put in CLEANFILES too.
pcvt Makefiles:
Fix DPADD. It was missing.
Fix CLEANFILES. Some temporary files were missing.
Fix CFLAGS. There were some `-I dir' options.
There must be no whitespace separating -I and -D options from the
corresponding args if these options are to be handled by bsd.dep.mk.
