Update appcompat prebuilts to build 7207786.

Taken from branch sc-release:
 ./update.py -b sc-release --build 7207786

Note that this is *not* sc-preview1-release which is set to be
released next, but sc-release which actually has the necessary
artifacts built.

Bug: 182537209
Test: unzip veridex-linux.zip && ./appcompat.sh --dex-file=test.apk
Change-Id: I9823e29dd194a4c9dbb4a99affeae8db0046b69b
4 files changed