[PATCH] Allow Samba/WAF to have pkg-config path overriden

[Zen]

I'm cross-compiling for a configuration where the target sysroot is
different from the build system.

In order for several parts of configure that use pkg-config to verify
dependencies to work they need to use the pkg-config from the targets root
not the build system.

I looked into it and the call to pkg-config is just in a string (which will
resolve in the context of the build machine). I looked at the latest
version of WAF [1] and it does something a little different and calls
find_program(). This will also not work correctly for this configuration
because it will still just look on the build systems path.

I attached a patch to check PKG_CONFIG environment variable (which is what
autoconf uses) first then fallback to using find_program() like the more
recent version of WAF does.

Thanks!

[1] -
https://github.com/waf-project/waf/blame/master/waflib/Tools/c_config.py#L236
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