release 6.12.4 (preliminary)

debian/patches/bugfix/x86/revert-perf-build-fix-libunwind-feature-detection-on.patch

@@ -11,7 +11,7 @@ It broke feature detection that was working just fine for us.
 
 --- a/tools/perf/Makefile.config
 +++ b/tools/perf/Makefile.config
-@@ -61,7 +61,7 @@ ifeq ($(SRCARCH),x86)
+@@ -56,7 +56,7 @@ ifeq ($(SRCARCH),x86)
      LIBUNWIND_LIBS = -lunwind-x86_64 -lunwind -llzma
      $(call detected,CONFIG_X86_64)
    else