Increased minimum ios deployment target.

(cherry picked from commit a7b210d448)

cmake/ConfigOptionsiOS.cmake

@@ -19,5 +19,5 @@ if (NOT FREERDP_IOS_EXTERNAL_SSL_PATH)
 	set(FREERDP_IOS_EXTERNAL_SSL_PATH "${CMAKE_CURRENT_SOURCE_DIR}/external/openssl")
 endif()
 mark_as_advanced(FREERDP_IOS_EXTERNAL_SSL_PATH)
-set(IOS_TARGET_SDK 9.3 CACHE STRING "Application target iOS SDK")
+set(IOS_TARGET_SDK 12.0 CACHE STRING "Application target iOS SDK")