- Do not use binutils-gold on s390x and try to minimize memory used
there at linking time.
- Ensure JIT is also disabled on s390x.

- Refresh webkitgtk-disable-gcc-version-checks.patch for latest
webkitgtk.

- Update to version 2.11.5:
+ Switch FTL to use B3 backend instead of LLVM.
+ Add support for windowless NPAPI plugins with no UI in non X11
platforms.
+ Fix a deadlock in the Web Process when JavaScript garbage
collector was running for a web worker thread that made google
maps to hang.
+ Fix a Web Process crash when quickly attempting many DnD
operations.
+ Fix scrollbars rendering with older versions of GTK+.
+ Fix a crash when creating a WebKitWebView without providing a
WebKitWebContext.
- Drop llvm-devel BuildRequires as upstream now supports B3 instead
of LLVM.

- Refresh webkitgtk-disable-gcc-version-checks.patch for latest
webkitgtk.

- Update to version 2.11.4:
+ Prefer to link to LLVM shared libraries when building with FTL
enabled.
+ Fix runtime errors when serializing/deserializing session
state.