Remove 5.x and 6.x cruft - source upgrades to RELENG_8 from versions prior

to RELENG_7 are not supported.

Makefile.inc1

@@ -841,10 +841,6 @@ update:
 # legacy: Build compatibility shims for the next three targets
 #
 legacy:
-.if ${BOOTSTRAPPING} < 503000
-	@echo "ERROR: Source upgrades from versions prior to 5.3 not supported."; \
-	false
-.endif
 .for _tool in tools/build
 	${_+_}@${ECHODIR} "===> ${_tool} (obj,includes,depend,all,install)"; \
 	    cd ${.CURDIR}/${_tool}; \
@@ -871,26 +867,6 @@ _groff=		gnu/usr.bin/groff/tmac
 .endif
 .endif
 
-.if ${BOOTSTRAPPING} < 600029
-_texinfo=	gnu/usr.bin/texinfo
-.endif
-
-.if ${BOOTSTRAPPING} < 600015
-_cap_mkdb=	usr.bin/cap_mkdb
-.endif
-
-.if ${BOOTSTRAPPING} < 600018
-_colldef=	usr.bin/colldef
-.endif
-
-.if ${BOOTSTRAPPING} < 600017
-_gencat=	usr.bin/gencat
-.endif
-
-.if ${BOOTSTRAPPING} < 600016
-_mklocale=	usr.bin/mklocale
-.endif
-
 .if ${BOOTSTRAPPING} < 700018
 _gensnmptree=	usr.sbin/bsnmpd/gensnmptree
 .endif
@@ -900,10 +876,6 @@ _gensnmptree=	usr.sbin/bsnmpd/gensnmptree
 _crunchgen=	usr.sbin/crunch/crunchgen
 .endif
 
-.if ${BOOTSTRAPPING} < 600020
-_pwd_mkdb=	usr.sbin/pwd_mkdb
-.endif
-
 bootstrap-tools:
 .for _tool in \
     ${_strfile} \

tools/build/Makefile

@@ -9,11 +9,6 @@ INCS=
 
 BOOTSTRAPPING?=	0
 
-# usr.bin/gencat needs <nl_types.h>.
-.if ${BOOTSTRAPPING} < 600017
-INCS+=		nl_types.h
-.endif
-
 .if empty(SRCS)
 SRCS=		dummy.c
 .endif