Build: update qcom_utils.mk

Add build macro to determine Android Release

Adding platform sdk version 18 for JB MR2.

Change-Id: I79aa831ddd335bd14bd777506c210acc5d9960f1
Fix the build for Xcode 5.

Change-Id: Icf8a4917d23114dae62a0e8ac3563587c3bf0361
Merge "Build: update qcom_utils.mk" into cm-10.2
Add a unique build number to every build

SDK-readable via android.os.Build.INCREMENTAL

Change-Id: If9885adebe12a56b2b2e353285721be695bc411b
Merge remote-tracking branch 'cm/cm-10.2' into cm-10.2-tonyp