pkg-pecl: Run tests during package build
Have pkg-pecl.mk run tests during the build process by running dh_auto_test for each of $DH_PHP_VERSIONS.
If the tests fail, then the build will be aborted. Since not all
extensions might be passing tests yet, this failure can be suppressed by
export REPORT_EXIT_STATUS=0 to d/rules.
I noticed this functionality was missing when porting luasandbox to use pkg-pecl.mk.