xcode4.2编译支持IOS3.1.2系统设置
1.Change the Target's "Build Settings" ==> "Architecture" from "Standard (armv7)" to "other". Add armv6 and armv7
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2.Open the projects *-Info.plist, remove the setting "Required device capabilities".
3.在TARGETS的设置中的Link other Flags添加-weak_library /usr/lib/libSystem.B.dylib
