community/libjxl: remove broken arg

oops, gcc thing

community/libjxl/APKBUILD

@@ -43,8 +43,8 @@ prepare() {
 build() {
 	CC=clang \
 	CXX=clang++ \
-	CFLAGS="$CFLAGS -ffat-lto-objects -flto=full" \
-	CXXFLAGS="$CXXFLAGS -ffat-lto-objects -flto=full" \
+	CFLAGS="$CFLAGS -flto=full" \
+	CXXFLAGS="$CXXFLAGS -flto=full" \
 	LDFLAGS="$LDFLAGS -fuse-ld=lld" \
 	cmake -B build -G Ninja \
 		-DCMAKE_BUILD_TYPE=Release \