ETCH-279 Adding support for iOS platforms

This patch adds support for iOS on the following architectures:
ARMv7, ARMv7S, ARM64, iPhoneSimulator 32 Bit, iPhoneSimulator 64 Bit

Test execution is only possible on the iPhone simulator.

Change-Id: I2e668df2e8829e94e20f298a8690f146996d263c

git-svn-id: https://svn.apache.org/repos/asf/etch/trunk@1580796 13f79535-47bb-0310-9956-ffa450edef68