cmd/dist, cmd/go: add environment variable override for pkg-config
Allow overriding default name of `pkg-config` tool via environment variable PKG_CONFIG (same as used by autoconf pkg.m4 macros). This facilitates easy cross-compilation of cgo code. Original patch against Go <= 1.4 was written by xnox_canonical <dimitri.ledkov@canonical.com> in 2014. Source: https://codereview.appspot.com/104960043/ Fixes #16253 Change-Id: I31c33ffc3ecbff65da31421e6188d092ab4fe7e4 Reviewed-on: https://go-review.googlesource.com/29991Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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