move the text of error messages from ERROR to the functions

move the text of error messages from ERROR to the functions
which generate them.

SCCS-vsn: usr.bin/pascal/libpc/ARGV.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/ASRT.c 1.2
SCCS-vsn: usr.bin/pascal/libpc/CHR.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/CTTOT.c 1.4
SCCS-vsn: usr.bin/pascal/libpc/DISPOSE.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/ERROR.c 1.8
SCCS-vsn: usr.bin/pascal/libpc/FLUSH.c 1.2
SCCS-vsn: usr.bin/pascal/libpc/FNIL.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/GET.c 1.2
SCCS-vsn: usr.bin/pascal/libpc/GETNAME.c 1.6
SCCS-vsn: usr.bin/pascal/libpc/HALT.c 1.2
SCCS-vsn: usr.bin/pascal/libpc/IOSYNC.c 1.5
SCCS-vsn: usr.bin/pascal/libpc/LINO.c 1.2
SCCS-vsn: usr.bin/pascal/libpc/LLIMIT.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/LN.c 1.4
SCCS-vsn: usr.bin/pascal/libpc/MAX.c 1.4
SCCS-vsn: usr.bin/pascal/libpc/NAM.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/NEW.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/NIL.c 1.2
SCCS-vsn: usr.bin/pascal/libpc/PACK.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/PAGE.c 1.2
SCCS-vsn: usr.bin/pascal/libpc/PCLOSE.c 1.4
SCCS-vsn: usr.bin/pascal/libpc/PCSTART.c 1.5
SCCS-vsn: usr.bin/pascal/libpc/PRED.c 1.4
SCCS-vsn: usr.bin/pascal/libpc/PUT.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/RANG4.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/READ4.c 1.5
SCCS-vsn: usr.bin/pascal/libpc/READ8.c 1.4
SCCS-vsn: usr.bin/pascal/libpc/READC.c 1.2
SCCS-vsn: usr.bin/pascal/libpc/READE.c 1.5
SCCS-vsn: usr.bin/pascal/libpc/READLN.c 1.4
SCCS-vsn: usr.bin/pascal/libpc/REMOVE.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/RESET.c 1.4
SCCS-vsn: usr.bin/pascal/libpc/REWRITE.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/RSNG4.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/SEEK.c 1.2
SCCS-vsn: usr.bin/pascal/libpc/SQRT.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/STLIM.c 1.2
SCCS-vsn: usr.bin/pascal/libpc/SUBSC.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/SUBSCZ.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/SUCC.c 1.4
SCCS-vsn: usr.bin/pascal/libpc/TEOF.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/TEOLN.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/UNIT.c 1.2
SCCS-vsn: usr.bin/pascal/libpc/UNPACK.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/UNSYNC.c 1.3
SCCS-vsn: usr.bin/pascal/libpc/WRITEC.c 1.4
SCCS-vsn: usr.bin/pascal/libpc/WRITEF.c 1.4
SCCS-vsn: usr.bin/pascal/libpc/WRITES.c 1.4
SCCS-vsn: usr.bin/pascal/libpc/WRITLN.c 1.2
SCCS-vsn: usr.bin/pascal/libpc/h00vars.h 1.7
SCCS-vsn: usr.bin/pascal/libpc/Makefile 1.8
SCCS-vsn: usr.bin/pascal/libpc/APPEND.c 1.2