Fix: build system

Hi developers

I'm afraid you don't notice the build system have been borken since
help system is replace to XSLTransform from asciidoc.
because the build system does'nt archives *.xsl files.

Please review the attached patches

Best regards.
----
teramako

common/Makefile

@@ -16,7 +16,7 @@ MAKE_JAR      = sh $(BASE)/make_jar.sh
 # TODO: specify source files manually?
 JAR_BASES     = $(TOP) $(BASE)
 JAR_DIRS      = content skin locale
-JAR_TEXTS     = js css dtd xml xul html xhtml
+JAR_TEXTS     = js css dtd xml xul html xhtml xsl
 JAR_BINS      = png
 
 JAR           = chrome/$(NAME).jar

common/make_jar.sh

@@ -19,7 +19,7 @@ getfiles () {
 }
 copytext () {
     sed -e "s,###VERSION###,$VERSION,g" \
-        -e "s,###DATE###,$DATE,g" \
+        -e "s,###DATE###,$BUILD_DATE,g" \
         <"$1" >"$2"
     cmp -s "$1" "$2" ||
     ( echo "modified: $1"; diff -u "$1" "$2" | grep '^[-+][^-+]' )