Add a dopey makefile to do the tags dance, which is probably not perfect

but is better than nothing by a good deal.

sys/alpha/Makefile

@@ -0,0 +1,29 @@
+# $FreeBSD$
+
+# Makefile for alpha tags file
+
+# SYS is normally set in Make.tags.inc
+# SYS=/sys
+
+TAGDIR=	alpha
+
+.include "../kern/Make.tags.inc"
+
+all:
+	@echo "make tags only"
+
+SALPHA=	${SYS}/alpha/mcbus/*.[ch] ${SYS}/alpha/tlsb/*.[ch] \
+	${SYS}/alpha/alpha/*.[ch] ${SYS}/alpha/pci/*.[ch] \
+	${SYS}/alpha/include/*.[ch] ${SYS}/alpha/isa/*.[ch] \
+	${SYS}/alpha/tc/*.[ch] ${SYS}/alpha/osf1/*.[ch] \
+	${SYS}/alpha/linux/*.[ch]
+AALPHA=	${SYS}/alpha/alpha/*.s
+
+tags::
+	@rm -f tags
+	-ctags -wdt ${COMM} ${SALPHA}
+	egrep "^ENTRY(.*)|^ALTENTRY(.*)" ${AALPHA} | \
+	    sed "s;\([^:]*\):\([^(]*\)(\([^, )]*\)\(.*\);\3 \1 /^\2(\3\4$$/;" \
+		>> tags
+	sort -o tags tags
+	chmod 444 tags