hg: jdk8/tl: 8006988: build-infra: Configure fails if 'cl' is in path on linux

[martinrb at google.com]

Changeset: a9c8a32d09f9
Author:    martin
Date:      2013-03-05 13:16 -0800
URL:       http://hg.openjdk.java.net/jdk8/tl/rev/a9c8a32d09f9

8006988: build-infra: Configure fails if 'cl' is in path on linux
Summary: Respect user CC and CXX environment variables; use cl iff on windows
Reviewed-by: erikj

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