Let's try to manage without building libcmis for iOS

libcmis needs curl and sice 618052e201318bcfba8a0fcdd29cf88eaa4a143e
we don't build that for iOS.

Change-Id: I78b5faa1a997a3e304cdbd80e254eab370caf552
Ignore also instdir_for_build and workdir_for_build

Change-Id: I2e6a26cd1e54ad28ec27f2205262413db039a136
We need an ENABLE_CURL, too

It is not enough to just have CURL in BUILD_TYPE or not. At least the
ftp UCP requires libcurl unconditionally, so it can't be built if we
don't have either a system or bundled libcurl.

Change-Id: I38e9939acb160d581e9a070a6cd7a0c89ddb5266