Add missing lex/yacc dependency for mkesdb/mkcsmapper bootstrap

This causes build failures on macOS where the build can end up invoking
an incompatible m4 binary.

Fxies:		2de949c ("Remove mkcsmapper_static and mkesdb_static from build-tools")

Makefile.inc1

@@ -2361,6 +2361,8 @@ ${_bt}-usr.bin/localedef: ${_bt}-usr.bin/yacc ${_bt_lex_depend}
 .if ${MK_ICONV} != "no"
 _mkesdb=	usr.bin/mkesdb
 _mkcsmapper=	usr.bin/mkcsmapper
+${_bt}-usr.bin/mkesdb: ${_bt}-usr.bin/yacc ${_bt_lex_depend}
+${_bt}-usr.bin/mkcsmapper: ${_bt}-usr.bin/yacc ${_bt_lex_depend}
 .endif
 
 .if ${MK_KERBEROS} != "no"