add shared target configuration wich set the bundle identifier prefix

this makes it easy to override the bundle identifier with reduced risk to accidentally committing the production bundle ID with project file changes

SharedConfig.xcconfig

@@ -0,0 +1,17 @@
+///*****************************************************************************
+// * VLC for iOS
+// *****************************************************************************
+// * Copyright (c) 2015 VideoLAN. All rights reserved.
+// * $Id$
+// *
+// * Authors: Tobias Conradi <videolan # tobias-conradi.de>
+// *
+// * Refer to the COPYING file of the official project for license.
+//*****************************************************************************/
+
+
+// Replace with your own reverse DNS name (not followed by a dot) before building.
+// The different target bundle identifer automatically use the identifier
+// Using com.example leads to com.example.vlc-ios for the iOS target.
+
+BUNDLE_IDENTIFIER_PREFIX=com.example

VLC for iOS.xcodeproj/project.pbxproj

@@ -851,6 +851,7 @@
 		DD2789E01B67A7BE00CED769 /* VLCWatchCommunication.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = VLCWatchCommunication.h; path = Sources/VLCWatchCommunication.h; sourceTree = SOURCE_ROOT; };
 		DD2789E11B67A7BE00CED769 /* VLCWatchCommunication.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = VLCWatchCommunication.m; path = Sources/VLCWatchCommunication.m; sourceTree = SOURCE_ROOT; };
 		DD2789E31B67A88600CED769 /* WatchConnectivity.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = WatchConnectivity.framework; path = System/Library/Frameworks/WatchConnectivity.framework; sourceTree = SDKROOT; };
+		DD29A3E81BF21E3D00A27A91 /* SharedConfig.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; path = SharedConfig.xcconfig; sourceTree = "<group>"; };
 		DD3567641B6760BF00338947 /* VLC WatchKit App.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = "VLC WatchKit App.app"; sourceTree = BUILT_PRODUCTS_DIR; };
 		DD3567671B6760BF00338947 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Interface.storyboard; sourceTree = "<group>"; };
 		DD3567691B6760BF00338947 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
@@ -1414,6 +1415,7 @@
 		7D94FCD216DE7D1000F2623B = {
 			isa = PBXGroup;
 			children = (
+				DD29A3E81BF21E3D00A27A91 /* SharedConfig.xcconfig */,
 				7D94FCE416DE7D1000F2623B /* iOS specific classes */,
 				7DADC55C1704FAA8001DAC63 /* XIBs */,
 				A7924697170F0ED20036AAF2 /* iOS Resources */,
@@ -3100,9 +3102,9 @@
 		};
 		7D94FD0816DE7D1100F2623B /* Debug */ = {
 			isa = XCBuildConfiguration;
+			baseConfigurationReference = DD29A3E81BF21E3D00A27A91 /* SharedConfig.xcconfig */;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
-				BUNDLE_IDENTIFIER_PREFIX = org.videolan;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
@@ -3133,9 +3135,9 @@
 		};
 		7D94FD0916DE7D1100F2623B /* Release */ = {
 			isa = XCBuildConfiguration;
+			baseConfigurationReference = DD29A3E81BF21E3D00A27A91 /* SharedConfig.xcconfig */;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
-				BUNDLE_IDENTIFIER_PREFIX = org.videolan;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
@@ -3265,9 +3267,9 @@
 		};
 		A7035BBF174519E40057DFA7 /* Distribution */ = {
 			isa = XCBuildConfiguration;
+			baseConfigurationReference = DD29A3E81BF21E3D00A27A91 /* SharedConfig.xcconfig */;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
-				BUNDLE_IDENTIFIER_PREFIX = org.videolan;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_WARN_CONSTANT_CONVERSION = YES;