Disable openCL by default on Mac (for now).

Change-Id: Iaf54a64a9e910eaffe1526f3471df8f98854343d

configure.ac

@@ -9811,14 +9811,15 @@ OPENCL_LIBS=
 OPENCL_CFLAGS=
 ENABLE_OPENCL=
 AC_MSG_CHECKING([OpenCL])
-if test \( -z "$with_opencl_sdk" -o "$with_opencl_sdk" = yes \) -a $_os = Darwin; then
-    # OS X
-    AC_MSG_RESULT([yes, always on OS X])
-    ENABLE_OPENCL=TRUE
-    OPENCL_CFLAGS=
-    OPENCL_LIBS="-framework OpenCL"
-    AC_DEFINE(HAVE_FEATURE_OPENCL)
-elif test -z "$with_opencl_sdk" -o "$with_opencl_sdk" = no; then
+dnl if test \( -z "$with_opencl_sdk" -o "$with_opencl_sdk" = yes \) -a $_os = Darwin; then
+dnl    # OS X
+dnl    AC_MSG_RESULT([yes, always on OS X])
+dnl    ENABLE_OPENCL=TRUE
+dnl    OPENCL_CFLAGS=
+dnl    OPENCL_LIBS="-framework OpenCL"
+dnl    AC_DEFINE(HAVE_FEATURE_OPENCL)
+dnl
+if test -z "$with_opencl_sdk" -o "$with_opencl_sdk" = no; then
     AC_MSG_RESULT([no])
 else
     if test -d "$with_opencl_sdk/include"; then