Made most plugins compile in MACOS build.

Signed-off-by: Damien Zammit <damien@zamaudio.com>
Fixes for MACOS build, requires CC CXX AR

Signed-off-by: Damien Zammit <damien@zamaudio.com>
Experimental fix for pugl osx build

Signed-off-by: Damien Zammit <damien@zamaudio.com>