Prospective build fix in the CI system for iOS

Tools contains the import scanner, which is needed by examples.

Change-Id: Ib32338b4b32bf6dd7f1f4a7a2cd5af14ef7eec7a
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>
iOS build fix for qmlplugindump

Do the docker startup thing only for Mac OS X, i.e. using the macx
scope in the .pro file, not mac.

Change-Id: I06266ace2ae0f8a3685b26983a7b2cd5815e3e99
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>
Prospective iOS build fix for tst_qqmlmoduleplugin

Include unistd.h for _PC_CASE_SENSITIVE

Change-Id: I0c57d7d84fa4c7379502dbf95fd22476724d5fa3
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>