use curl sdk link

Author: longbai

QiniuSDK.xcodeproj/project.pbxproj

@@ -144,7 +144,7 @@
 		DF0D23CC19DCE6C400D6B68F /* QNResponseInfo.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = QNResponseInfo.h; sourceTree = "<group>"; };
 		DF0D23CE19DCE6E500D6B68F /* QNResponseInfo.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = QNResponseInfo.m; sourceTree = "<group>"; };
 		DF293C9019DB85CB00799011 /* libz.dylib */ = {isa = PBXFileReference; lastKnownFileType = "compiled.mach-o.dylib"; name = libz.dylib; path = usr/lib/libz.dylib; sourceTree = SDKROOT; };
-		DF293C9319DB860200799011 /* libz.dylib */ = {isa = PBXFileReference; lastKnownFileType = "compiled.mach-o.dylib"; name = libz.dylib; path = Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.2.sdk/usr/lib/libz.dylib; sourceTree = DEVELOPER_DIR; };
+		DF293C9319DB860200799011 /* libz.dylib */ = {isa = PBXFileReference; lastKnownFileType = "compiled.mach-o.dylib"; name = libz.dylib; path = Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/libz.dylib; sourceTree = DEVELOPER_DIR; };
 		DF293C9619DB865800799011 /* QNCrc32Test.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = QNCrc32Test.m; sourceTree = "<group>"; };
 		DF293C9C19DBC2AE00799011 /* QNUserAgent.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = QNUserAgent.h; sourceTree = "<group>"; };
 		DF293C9D19DBC2AE00799011 /* QNUserAgent.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = QNUserAgent.m; sourceTree = "<group>"; };