perf kbuild: move a x86-only tsc test into an arch-specific directory
perf kbuild: fix a compilation issue if libelf is unavailable
perf kbuild: add a missing precompilation directive

HAVE_PERF_REGS_SUPPORT was missing in util/perf_regs.c if this feature
was unavailable.
perf kbuild: remove an obsolete Makefile in arch/powerpc
perf kbuild: add missing Kbuild files for arm architecture
perf kbuild: fix a checkpatch warning in arch/x86/Kbuild
perf kbuild: add missing Kbuild files for sh architecture
perf kbuild: add missing Kbuild files for arm64 architecture
perf kbuild: add missing Kbuild files for s390 architecture
perf kbuild: add missing Kbuild files for sparc architecture
perf kbuid: fix a bad include path after the move of the tsc test
perf kbuild: improve outputs of clean and install targets
perf kbuild: take into account DESTDIR and prefix set in the command line