docs: always include docs/man/xrdp-mkfv1.8.in to dist tarball #415

Job	Run time
code formatting check	26s
cppcheck	19m 29s
min features with gcc	1m 58s
min features with g++	2m 44s
min features with clang	2m 6s
max features with gcc	2m 39s
max features with g++	2m 44s
max features with clang	3m 41s
max features with gcc and DEBUG	2m 10s
max features with gcc for 32-bit arch (legacy OS)	1m 34s
max features with g++ for 32-bit arch (legacy OS)	2m 7s
max features with clang for 32-bit arch (legacy OS)	1m 55s
	43m 33s

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