improve make sloc: 7989 core

SLOC	Directory	SLOC-by-Language (Sorted)
29534   syn             ansic=24983,yacc=4166,sh=259,perl=72,java=54
23899   lib             ansic=23354,cpp=545
7989    core            ansic=7989
754     front           ansic=754

Totals grouped by language (dominant language first):
ansic:        57080 (91.80%)
yacc:          4166 (6.70%)
cpp:            545 (0.88%)
sh:             259 (0.42%)
perl:            72 (0.12%)
java:            54 (0.09%)