add libbpg-mac static lib target
add libbpg-mac static lib target

jasongorski/libbpg-xcode,jasongorski/libbpg-xcode,thuskey/libbpg-xcode,jasongorski/libbpg-xcode,jasongorski/libbpg-xcode,jasongorski/libbpg-xcode,jasongorski/libbpg-xcode,jasongorski/libbpg-xcode,thuskey/libbpg-xcode,thuskey/libbpg-xcode