detect-toolchains: detect also compilers in the path on osx

Change-Id: Ifd0762775adbb36c7952f1773e7de14c79f919d1
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
ios: use same compiler flags as xcode

Change-Id: I66c09b7420ce7bd2f9e08c764dd62ea19cd26a35
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>