Xcode: Make iOS tests compatible with Xcode 11

Tests/RunCMake/XcodeProject/XcodeBundles.cmake

@@ -5,6 +5,7 @@ enable_language(C)
 
 if(CMAKE_SYSTEM_NAME STREQUAL "iOS")
   set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
+  set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "")
   set(CMAKE_XCODE_ATTRIBUTE_ENABLE_BITCODE "NO")
 endif()
 

Tests/RunCMake/XcodeProject/XcodeIOSInstallCombined.cmake

@@ -11,6 +11,7 @@ if(NOT IOS)
 endif()
 
 set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
+set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "")
 set(CMAKE_XCODE_ATTRIBUTE_DEBUG_INFORMATION_FORMAT "dwarf")
 set(CMAKE_XCODE_ATTRIBUTE_ENABLE_BITCODE "NO")
 

Tests/RunCMake/XcodeProject/XcodeIOSInstallCombinedPrune.cmake

@@ -7,6 +7,7 @@ if(XCODE_VERSION VERSION_GREATER_EQUAL 9)
 endif()
 
 set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
+set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "")
 set(CMAKE_XCODE_ATTRIBUTE_DEBUG_INFORMATION_FORMAT "dwarf")
 
 add_library(foo SHARED foo.cpp)

Tests/RunCMake/XcodeProject/XcodeIOSInstallCombinedSingleArch.cmake

@@ -7,6 +7,7 @@ if(XCODE_VERSION VERSION_GREATER_EQUAL 9)
 endif()
 
 set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
+set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "")
 set(CMAKE_XCODE_ATTRIBUTE_DEBUG_INFORMATION_FORMAT "dwarf")
 
 add_library(foo SHARED foo.cpp)