45215ffc8a
Fixes:
http://autobuild.buildroot.net/results/69cf9326539c8df8fa50c5e7acb2ce3bb985ede2/
The PDO mysql extension also needs the hash extension - so select it,
similar to how it was done for the mysqli extension in commit 65f9645263
(php: fix build with mysqli).
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>