Fix name of libWebKit for newer releases.

Yes, we're now officially using "legacy" WebKit!

build/jam/BuildFeatures

@@ -388,15 +388,27 @@ if $(HAIKU_BUILD_FEATURE_TAGLIB) {
 
 # WebKit
 if [ IsPackageAvailable haikuwebkit_devel ] {
-	ExtractBuildFeatureArchives webkit :
-		file: base haikuwebkit
-			runtime: lib
-		file: devel haikuwebkit_devel
-			depends: base
-			libraries:
-				$(developLibDir)/libWebKit.so
-			headers: $(developHeadersDir)
-		;
+	if $(TARGET_PACKAGING_ARCH) = x86_64 {
+		ExtractBuildFeatureArchives webkit :
+			file: base haikuwebkit
+				runtime: lib
+			file: devel haikuwebkit_devel
+				depends: base
+				libraries:
+					$(developLibDir)/libWebKit.so
+				headers: $(developHeadersDir)
+			;
+	} else {
+		ExtractBuildFeatureArchives webkit :
+			file: base haikuwebkit
+				runtime: lib
+			file: devel haikuwebkit_devel
+				depends: base
+				libraries:
+					$(developLibDir)/libWebKitLegacy.so
+				headers: $(developHeadersDir)
+			;
+	}
 
 	EnableBuildFeatures webkit ;
 } else {