Stop building a JAR file.

It's no longer necessary to build a JAR file in the newer versions of
Thunderbird we're targeting, and it doesn't really provide any benefits.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>

Makefile

@@ -3,6 +3,5 @@ SHELL = bash
 all:
 	@ver=$$(grep "<version>" install.rdf | perl -p -e 's/[^\d]//g') ;\
     name=$$(basename $$(pwd)) ; \
-    cd chrome ; rm -f $${name}.jar; zip -r $${name}.jar content locale -x '*/.git/*' > /dev/null; \
-    cd .. ; rm -f $${name}_v$$ver.xpi; zip -r $${name}_v$$ver.xpi  chrome/*.jar install.rdf chrome.manifest makefile defaults -x '*/.git/*' > /dev/null; \
+    rm -f $${name}_v$$ver.xpi; zip -r $${name}_v$$ver.xpi  chrome install.rdf chrome.manifest Makefile defaults -x '*/.git/*' > /dev/null; \
     echo "$${name}_v$$ver.xpi Done."

chrome.manifest

@@ -1,5 +1,5 @@
 overlay	chrome://messenger/content/messengercompose/messengercompose.xul	chrome://extedit/content/extedit.xul
 overlay	chrome://global/content/customizeToolbar.xul	chrome://extedit/content/extedit.xul
-content	extedit	jar:chrome/extedit.jar!/content/
-locale	extedit	en-US	jar:chrome/extedit.jar!/locale/en-US/extedit/
+content	extedit	/chrome/content/
+locale	extedit	en-US	/chrome/locale/en-US/extedit/