Allow overriding CC, AR, and RANLIB from the environment Rather than unconditionally setting CC, AR, and RANLIB, allow the environment to override them. This is useful in more circumstances than just cross-compiling. Thanks to Tormod Volden <debian.tormod@gmail.com> for bringing this to my notice though his original suggestion was different.

\.exe$
\.o$
\.d$
\.a$
~$
\.orig$
/lwbasic$
/lwlink$
/lwobjdump$
/lwar$
/lwasm$
/lwcc/lwcc$
/lwcc/lwcpp$