Raise minimum required version of libimobiledevice to 1.1.5

lockdownd_service_descriptor_t is not available prior to 1.1.5
Fix build error
Check for glibtoolize first and use that if found instead of libtoolize

http://developer.apple.com/library/mac/DOCUMENTATION/Darwin/Reference/Ma
nPages/Xcode-3.2.5/man1/glibtoolize.1.html

Homebrew also renames libtoolize to glibtoolize