Merge branch 'asm-generic-headers-cleanup' into asm-generic

A series from Masahiro Yamada to clean up the uapi headers, making
sure they can actually be included from user space without additional
dependencies on either kernel headers or specific libc versions.

* asm-generic-headers-cleanup:
  sparc: add asm/stat.h to UAPI compile-test coverage
  powerpc: add asm/stat.h to UAPI compile-test coverage
  mips: add asm/stat.h to UAPI compile-test coverage
  riscv: add linux/bpf_perf_event.h to UAPI compile-test coverage
  kbuild: prevent exported headers from including <stdlib.h>, <stdbool.h>
  agpgart.h: do not include <stdlib.h> from exported header