Build fix for "[Xcode] Support building into a WebKit-specific produc…

…ts directory for archival purposes"

https://bugs.webkit.org/show_bug.cgi?id=264214
rdar://117948754

Unreviewed.

Xcode's run action uses an in-process (non-XCBuild) codepath for
resolving build settings, which struggles to expand $(inherited) for
CONFIGURATION_BUILD_DIR (rdar://118201428).

Replace with a semantically equivalent definition that does not use
$(inherited).

* Configurations/WebKitProjectPaths.xcconfig:

Canonical link: https://commits.webkit.org/270507@main

Configurations/WebKitProjectPaths.xcconfig

@@ -33,6 +33,13 @@ WK_OVERRIDE_FRAMEWORKS_DIR_USE_STAGING_INSTALL_PATH_YES = $(WK_INSTALL_PATH_PREF
 WK_QUOTED_OVERRIDE_FRAMEWORKS_DIR = $(WK_QUOTED_OVERRIDE_FRAMEWORKS_DIR_$(WK_USE_OVERRIDE_FRAMEWORKS_DIR));
 WK_QUOTED_OVERRIDE_FRAMEWORKS_DIR_YES = "$(WK_OVERRIDE_FRAMEWORKS_DIR)";
 
+// Set WK_CONFIGURATION_BUILD_DIR to customize the directory WebKit builds into
+// without affecting other projects in the build request. Avoid $(inherited)
+// due to rdar://118201428.
+CONFIGURATION_BUILD_DIR = $(CONFIGURATION_BUILD_DIR_$(WK_EMPTY_$(WK_CONFIGURATION_BUILD_DIR)));
+CONFIGURATION_BUILD_DIR_ = $(WK_CONFIGURATION_BUILD_DIR);
+CONFIGURATION_BUILD_DIR_YES = $(CONFIGURATION_BUILD_DIR);
+
 WK_LIBRARY_HEADERS_FOLDER_PATH = $(WK_LIBRARY_HEADERS_FOLDER_PATH_OVERRIDE_$(WK_USE_OVERRIDE_FRAMEWORKS_DIR));
 WK_LIBRARY_HEADERS_FOLDER_PATH_OVERRIDE_NO = /usr/local/include;
 WK_LIBRARY_HEADERS_FOLDER_PATH_OVERRIDE_YES = /usr/local/include/safari-sdk;