Back out change accidentally committed as Makefile:1.21 -- a local

tweak to let the 6.x/7.x kernel series build on a 5.x userland.

Pointed out by:		njl

sys/dev/aic7xxx/aicasm/Makefile

@@ -33,7 +33,6 @@ CFLAGS+= ${NOSTDINC} -I/usr/include -I.
 .ifdef MAKESRCPATH
 CFLAGS+= -I${MAKESRCPATH}
 .endif
-NOMAN=
 NO_MAN=
 YFLAGS= -b ${.TARGET:R} ${.TARGET:M*macro*:S/$(.TARGET)/-p mm/} -d
 LFLAGS+= ${.TARGET:M*macro*:S/$(.TARGET)/-Pmm/}