Autotools: Quote PHP_CHECK_SIZEOF macro arguments

[skip ci]

Author: petk

configure.ac

@@ -461,9 +461,9 @@ AC_CHECK_TYPES([socklen_t], [], [], [
 ])
 
 dnl These are defined elsewhere than stdio.h.
-PHP_CHECK_SIZEOF(intmax_t, 0)
-PHP_CHECK_SIZEOF(ssize_t, 8)
-PHP_CHECK_SIZEOF(ptrdiff_t, 8)
+PHP_CHECK_SIZEOF([intmax_t], [0])
+PHP_CHECK_SIZEOF([ssize_t], [8])
+PHP_CHECK_SIZEOF([ptrdiff_t], [8])
 
 dnl Check stdint types (must be after header check).
 PHP_CHECK_STDINT_TYPES