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Automatically pick the latest installed iOS SDK when building with make

This avoids having to update the makefile just to change the SDK
version whenever the iOS SDK is updated (since the previous
version is removed on updates).

--- a/build/platform-ios.mk

+++ b/build/platform-ios.mk

@@ -2,12 +2,12 @@

 include build/platform-darwin.mk

 CXX = clang++

 CC = clang

-SDK = 7.0

 ifneq ($(filter %86 x86_64, $(ARCH)),)

 SDKTYPE = iPhoneSimulator

 else

 SDKTYPE = iPhoneOS

 endif

+SDK = $(shell xcrun --sdk $(shell echo $(SDKTYPE) | tr A-Z a-z) --show-sdk-version)

 SDK_MIN = 5.1

 SDKROOT = /Applications/Xcode.app/Contents/Developer/Platforms/$(SDKTYPE).platform/Developer/SDKs/$(SDKTYPE)$(SDK).sdk