Add pkg-config for OSX
Add pkg-config for OSX

ALikhachev/saltfs,ALikhachev/saltfs,setupminimal/saltfs,UK992/saltfs,UK992/saltfs,rwaweber/saltfs,ALikhachev/saltfs,setupminimal/saltfs,setupminimal/saltfs,servo/saltfs,UK992/saltfs,rwaweber/saltfs,rwaweber/saltfs,servo/saltfs