Add include path '..' for libtestutil
Add include path '..' for libtestutil

Since it uses some of the apps/ stuff and some of them include e_os.h...

Reviewed-by: Rich Salz <c04971a99e5a9ee80eaab4b1deb37e845b0bd697@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3307)
openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl