Remove support for building as .war

The war support is unused as far as we know, and creates extra work
when porting gitiles to a different build system.

Change-Id: Ib8f1870390cbfd29ef0c5a062c15e060ce6116bd

BUCK

diff --git a/BUCK b/BUCK
index 913ab47..7fd0f96 100644
--- a/BUCK
+++ b/BUCK
@@ -5,7 +5,6 @@
   '//gitiles-servlet:servlet',
   '//gitiles-servlet:src',
   '//gitiles-servlet:javadoc',
-  '//gitiles-war:gitiles',
 ]
 
 java_library(
@@ -32,7 +31,7 @@
   for d in DEPS:
     n,t = d.split(':')
     a.add(t)
-    out = "%s.%s" % (t, 'war' if 'war' in n else 'jar')
+    out = "%s.jar" % t
     genrule(
       name = t,
       cmd = 'ln -s $(location %s) $OUT' % d,