Package both swt.jar for linux-x86 and linux-x86_64.

This depends on another CL in prebuilt that packages
both linux-x86/swt/swt.jar and linux-x86/swt_64/swt_64.jar:

  https://android-git.corp.google.com/g/5178

The new jar are picked from out/... rather than prebuilt,
which seems to work better.

build/sdk-linux-x86.atree

@@ -2,5 +2,5 @@
 #
 
 # swt
-prebuilt/linux-x86/swt/swt.jar tools/lib/x86/swt.jar
-prebuilt/linux-x86_64/swt/swt.jar tools/lib/x86_64/swt.jar
+framework/swt.jar    tools/lib/x86/swt.jar
+framework/swt_64.jar tools/lib/x86_64/swt.jar