Don't apply ctf conversions in POSIX mode. These can't happen there

because they pollute the POSIX environment, which doens't allow
for these extentions. ctf conversions are really only relevant when
used in coordination with the rest of the bsd*.mk system anyway.
Leave them in place for the normal, non-posix enviornment since
they are quite useful there.

share/mk/sys.mk

@@ -171,11 +171,9 @@ YFLAGS		?=	-d
 # SINGLE SUFFIX RULES
 .c:
 	${CC} ${CFLAGS} ${LDFLAGS} -o ${.TARGET} ${.IMPSRC}
-	${CTFCONVERT_CMD}
 
 .f:
 	${FC} ${FFLAGS} ${LDFLAGS} -o ${.TARGET} ${.IMPSRC}
-	${CTFCONVERT_CMD}
 
 .sh:
 	cp -f ${.IMPSRC} ${.TARGET}
@@ -185,25 +183,21 @@ YFLAGS		?=	-d
 
 .c.o:
 	${CC} ${CFLAGS} -c ${.IMPSRC}
-	${CTFCONVERT_CMD}
 
 .f.o:
 	${FC} ${FFLAGS} -c ${.IMPSRC}
-	${CTFCONVERT_CMD}
 
 .y.o:
 	${YACC} ${YFLAGS} ${.IMPSRC}
 	${CC} ${CFLAGS} -c y.tab.c
 	rm -f y.tab.c
 	mv y.tab.o ${.TARGET}
-	${CTFCONVERT_CMD}
 
 .l.o:
 	${LEX} ${LFLAGS} ${.IMPSRC}
 	${CC} ${CFLAGS} -c lex.yy.c
 	rm -f lex.yy.c
 	mv lex.yy.o ${.TARGET}
-	${CTFCONVERT_CMD}
 
 .y.c:
 	${YACC} ${YFLAGS} ${.IMPSRC}