Based on [1] which got reverted[2] because it failed for gold, however
we do not support the gold linker either way anymore and can use this
method until upstream finds their own solution.

Note that !use_bfd is not a thing, so we need to check other linkers.
Reported to work fine for mold, while it is unknown for the new'ish
wild. At worst using the bfd path will just be slightly slower assuming
the linker is even remotely compatible.

As a precaution, keeping the previous !is_clang albeit it should not
matter.

https://qt-project.atlassian.net/browse/QTBUG-141153
https://github.com/gentoo/gentoo/pull/45441

[1] https://codereview.qt-project.org/c/qt/qtwebengine-chromium/+/684653
[2] https://codereview.qt-project.org/c/qt/qtwebengine-chromium/+/690328
--- a/src/3rdparty/chromium/build/config/compiler/BUILD.gn
+++ b/src/3rdparty/chromium/build/config/compiler/BUILD.gn
@@ -2760,5 +2760,5 @@
 #    .o files, instead of just references to .o files in the build directoy
 config("thin_archive") {
-  if ((is_apple && use_lld) || (is_linux && !is_clang) || current_os == "aix") {
+  if ((is_apple && use_lld) || (is_linux && (!is_clang || (!use_lld && !use_mold))) || current_os == "aix") {
     # The macOS and iOS linker ld64.ldd doesn't support thin archive without
     # symbol table, gcc on linux also throws the error `archive has no index`.