Disable tracing JIT on AppVeyor

This is a temporary measure until the current issues[1] are resolved.

[1] <0e1e991#commitcomment-40805659>

Author: cmb69

appveyor/test_task.bat

@@ -63,7 +63,7 @@ set OPENSSL_CONF=
 rem set SSLEAY_CONF=
 
 rem prepare for Opcache
-if "%OPCACHE%" equ "1" set OPCACHE_OPTS=-d opcache.enable=1 -d opcache.enable_cli=1 -d opcache.protect_memory=1 -d opcache.jit_buffer_size=16M
+if "%OPCACHE%" equ "1" set OPCACHE_OPTS=-d opcache.enable=1 -d opcache.enable_cli=1 -d opcache.protect_memory=1 -d opcache.jit_buffer_size=16M -d opcache.jit=1205
 
 rem prepare for enchant
 mkdir C:\usr\local\lib\enchant-2