Fix for custom attr handles duck-punching the boolean attr handle
Pass all tests (and load Sizzle fixture correctly) when loading with AMD

Conflicts:
	src/css.js
Fix #14318: Cherry-pick interrupted animation fix from master ea5c22ec12e6a548b1ec2d7b0dcd9f71bea8d5dd
Ref #14313: Optimize 1.x jQuery.merge for size.
(cherry picked from commits c75c9a8ebb5d2483daa68bec799e0d770083a811 f66d53c85643e703a8e37d9ca9375dd386a60cda)
No ticket: Hide the testing-support jQuery from tests
(cherry picked from commit 0c185209233f4c15e57c6a24e8f81b27dd26db59)

Conflicts:

	test/data/testrunner.js