Add a helper script used to take an Intel-supplied ACPI CA drop and make it

ready for importing.  This should save me from my own over-cleanliness.

sys/contrib/dev/acpica/acpica_prep.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+# $FreeBSD$
+#
+# Unpack an ACPI CA drop and restructure it to fit the FreeBSD layout
+#
+
+src=$1
+wrk=./_acpi_ca_unpack
+dst=./acpi_ca_destination
+
+# files to remove
+stripdirs="compiler"
+stripfiles="osunixxf.c 16bit.h Makefile a16find.c a16utils.asm a16utils.obj\
+    acintel.h aclinux.h acmsvc.h acwin.h acwin64.h getopt.c"
+
+# pre-clean
+echo pre-clean
+rm -rf ${wrk}
+rm -rf ${dst}
+mkdir -p ${wrk}
+mkdir -p ${dst}
+
+# unpack
+echo unpack
+tar -x -z -f ${src} -C ${wrk}
+
+# strip files
+echo strip
+for i in ${stripdirs}; do
+    find ${wrk} -name ${i} -type d | xargs rm -r
+done
+for i in ${stripfiles}; do
+    find ${wrk} -name ${i} -type f -delete
+done
+
+# move files to destination
+echo copy
+find ${wrk} -type f | xargs -J % mv % ${dst}
+
+# post-clean
+echo post-clean
+rm -rf ${wrk}