Try again to fix the iOS build after r231063.

* Configurations/Base.xcconfig:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@231076 268f45cc-cd09-0410-ab3c-d52691b4dbfc
diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
index 74f10c6..b7034f3 100644
--- a/Source/WebKit/ChangeLog
+++ b/Source/WebKit/ChangeLog
@@ -1,3 +1,9 @@
+2018-04-26  Andy Estes  <aestes@apple.com>
+
+        Try again to fix the iOS build after r231063.
+
+        * Configurations/Base.xcconfig:
+
 2018-04-26  Jer Noble  <jer.noble@apple.com>
 
         WK_COCOA_TOUCH the WK_ACCESSIBILITY_LDFLAGS
diff --git a/Source/WebKit/Configurations/Base.xcconfig b/Source/WebKit/Configurations/Base.xcconfig
index bada5ef..6354498 100644
--- a/Source/WebKit/Configurations/Base.xcconfig
+++ b/Source/WebKit/Configurations/Base.xcconfig
@@ -126,7 +126,9 @@
 SUPPORTS_TEXT_BASED_API[sdk=iphone*] = $(USE_INTERNAL_SDK);
 SUPPORTS_TEXT_BASED_API[sdk=appletv*] = NO;
 SUPPORTS_TEXT_BASED_API[sdk=watch*] = NO;
-OTHER_TAPI_FLAGS[sdk=iphone*] = -x objective-c++ -std=c++14 -fno-rtti -DRELEASE_WITHOUT_OPTIMIZATIONS;
+
+OTHER_TAPI_FLAGS = $(OTHER_TAPI_FLAGS_$(WK_COCOA_TOUCH));
+OTHER_TAPI_FLAGS_cocoatouch = -x objective-c++ -std=c++14 -fno-rtti -DRELEASE_WITHOUT_OPTIMIZATIONS;
 TAPI_VERIFY_MODE[sdk=iphone*] = Pedantic;
 
 // This is required to make LLVM_TARGET_TRIPLE_SUFFIX propagate into scripts.