base64: add termios.h #256

Job	Run time	Billable time
makefile-analysis	34s	0s
makefile-alpine-amd64-gcc	12s	0s
cmake-ubuntu-20.04-x86_64	5s	0s
cmake-ubuntu-20.04-i686	33s	0s
cmake-alpine-amd64-gcc	14s	0s
cmake-alpine-armv7-gcc	1m 1s	0s
cmake-macos-11-x86_64	16s	0s
makefile-alpine-armv7-gcc	1m 1s	0s
cmake-alpine-armv7-clang	1m 31s	0s
cmake-windows-2019-x86_64	1m 12s	0s
makefile-ubuntu-20.04-amd64-gcc	5s	0s
cmake-windows-2019-i686	42s	0s
makefile-alpine-armv7-clang	1m 27s	0s
cmake-alpine-aarch64-gcc	1m 23s	0s
makefile-ubuntu-20.04-amd64-gcc +openmp	4s	0s
makefile-alpine-aarch64-gcc	1m 6s	0s
cmake-alpine-aarch64-clang	1m 42s	0s
makefile-ubuntu-20.04-amd64-clang	6s	0s
cmake-alpine-s390x-gcc	1m 13s	0s
makefile-alpine-aarch64-clang	1m 30s	0s
makefile-ubuntu-20.04-amd64-clang +openmp	5s	0s
cmake-alpine-s390x-clang	1m 43s	0s
makefile-alpine-s390x-gcc	1m 4s	0s
cmake-alpine-ppc64le-gcc	1m 5s	0s
makefile-alpine-s390x-clang	1m 34s	0s
makefile-macos-11-amd64-clang	14s	0s
cmake-alpine-ppc64le-clang	1m 33s	0s
makefile-alpine-ppc64le-gcc	54s	0s
makefile-alpine-ppc64le-clang	1m 18s	0s
msys2-cmake-msys	1m 5s	0s
msys2-makefile-msys	50s	0s
msys2-makefile-mingw32	1m 24s	0s
msys2-cmake-mingw32	1m 43s	0s
msys2-makefile-mingw64	1m 23s	0s
msys2-cmake-mingw64	1m 43s	0s
msys2-makefile-ucrt64	1m 27s	0s
msys2-cmake-ucrt64	1m 42s	0s
msys2-cmake-clang32	1m 44s	0s
msys2-cmake-clang64	1m 46s	0s
	40m 14s	0s

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