Cherry-pick c6eb5df. rdar://122947207

    Unreviewed, fix internal builds that use `WKWebView+TextExtraction.swift.in`
    rdar://122947207

    Partially revert support for text extraction, until we're able to reliably block the WebKitSwift
    installhdrs phase on the WebKitAdditions build being finished.

    * Source/WebKit/Configurations/WebKitSwift.xcconfig:
    * Source/WebKit/DerivedSources.make:

    Canonical link: https://commits.webkit.org/274628@main

Canonical link: https://commits.webkit.org/274594.1@safari-7619.1.4-branch

Source/WebKit/Configurations/WebKitSwift.xcconfig

@@ -45,8 +45,9 @@ WK_HAVE_MARKETPLACE_KIT_IOS_SINCE_17 = YES;
 WK_EXCLUDED_MARKETPLACE_KIT_WRAPPER_FILES = $(WK_EXCLUDED_MARKETPLACE_KIT_WRAPPER_FILES_$(WK_AND_$(USE_INTERNAL_SDK)_$(WK_HAVE_MARKETPLACE_KIT)));
 WK_EXCLUDED_MARKETPLACE_KIT_WRAPPER_FILES_NO = MarketplaceKitWrapper.swift;
 
-WK_EXCLUDED_TEXT_EXTRACTION_FILES = $(WK_EXCLUDED_TEXT_EXTRACTION_FILES_$(USE_INTERNAL_SDK))
-WK_EXCLUDED_TEXT_EXTRACTION_FILES_ = WKWebView+TextExtraction.swift
+// FIXME: Remove this from excluded files once we figure out how to block WebKitSwift's
+// installhdrs phase on WebKitAdditions.
+WK_EXCLUDED_TEXT_EXTRACTION_FILES = WKWebView+TextExtraction.swift
 
 EXCLUDED_SOURCE_FILE_NAMES = $(WK_EXCLUDED_COORDINATOR_FILES) $(WK_EXCLUDED_MARKETPLACE_KIT_WRAPPER_FILES) $(WK_EXCLUDED_TEXT_EXTRACTION_FILES) $(EXCLUDED_IOS_RESOURCE_FILE_NAMES) $(EXCLUDED_MACOS_PLUGIN_FILE_NAMES)
 SWIFT_INSTALL_OBJC_HEADER = NO

Source/WebKit/DerivedSources.make

@@ -882,7 +882,6 @@ all : module.private.modulemap
 
 ifeq ($(USE_INTERNAL_SDK),YES)
 WEBKIT_ADDITIONS_SWIFT_FILES = \
-	WKWebView+TextExtraction.swift \
 #
 
 $(WEBKIT_ADDITIONS_SWIFT_FILES): %.swift : %.swift.in