configure: Avoid use of AC_CHECK_FILE for cross compiling

The AC_CHECK_FILE macro can't be used for cross compiling as it will
result in "error: cannot check for file existence when cross compiling".
Replace it with the AS_IF macro.

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
Signed-off-by: Jonathan Liu <net147@gmail.com>
1 file changed