Tweaks to the func4.test test module (which tests the rarely used totype.c

Tweaks to the func4.test test module (which tests the rarely used totype.c
extension) so that it works on i586 compiled using gcc-13 with -O0.  Details
at [forum:/forumpost/0a7553b0f734c033|forum post 0a7553b0f734c033].

FossilOrigin-Name: d0fbe779bc2460e120da4f39063a9f4121c700f0b86d85f4311715b1366c3515