hg: build-infra/jdk8: 8001901: build-infra: Fix "misbehaving" which command on Solaris

[erik.joelsson at oracle.com]

Changeset: 1bd53b9a674e
Author:    erikj
Date:      2012-12-10 14:05 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/1bd53b9a674e

8001901: build-infra: Fix "misbehaving" which command on Solaris
Summary: Replaced only usage of which with own implementation.

! common/autoconf/basics.m4
! common/autoconf/generated-configure.sh