Prevent test case failure

If opcache.log_verbosity_level is greater than 1, opcache will raise
warnings, which will be written to stderr in the default case.  These
warnings are actually to be expected, but would break the test, so we
make sure that the log_verbosity_level is 1 when running this test.

Author: cmb69

ext/opcache/tests/bug66461.phpt

@@ -4,6 +4,7 @@ Bug #66461 (PHP crashes if opcache.interned_strings_buffer=0)
 opcache.enable=1
 opcache.enable_cli=1
 opcache.optimization_level=-1
+opcache.log_verbosity_level=1
 opcache.file_update_protection=0
 opcache.interned_strings_buffer=0
 --SKIPIF--