clipboard: Allow a file read to return 0 for EOF #1107

Job	Run time
code formatting check	38s
cppcheck	18m 59s
min features with gcc	2m 30s
min features with g++	1m 50s
min features with clang	2m 56s
max features with gcc	3m 23s
max features with g++	2m 27s
max features with clang	4m 7s
max features with gcc and DEBUG	2m 18s
max features with gcc for 32-bit arch (legacy OS)	1m 25s
max features with g++ for 32-bit arch (legacy OS)	1m 27s
max features with clang for 32-bit arch (legacy OS)	1m 36s
	43m 36s

Provide feedback