v1.21.1
[arm] Provide dummy implementations for {in,out}[s]{b,w,l}
[build] Fix ARM32 EFI builds with current EDK2 headers
[build] Disable position-independent code for ARM64 EFI builds
[build] Use -no-pie on newer versions of gcc
[malloc] Rename malloc_dma() to malloc_phys()
[build] Prevent use of MMX and SSE registers