eofkiller.c: build fix

[ghost]

Hello!

{standard input}: Assembler messages:
{standard input}:496: Error: symbol __isoc99_scanf is already defined
{standard input}:622: Error: symbol __isoc99_fscanf is already defined
make[2]: *** [CMakeFiles/eofkiller.dir/build.make:63: CMakeFiles/eofkiller.dir/src/eofkiller.c.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:480: CMakeFiles/eofkiller.dir/all] Error 2
make: *** [Makefile:84: all] Error 2

Fix for Arch Linux build.
Thanks in advance!

[zardus]

My understanding is that this would fix for arch, but break for, say, Ubuntu 18.04... Can you think of a way to prevent breakage on non-arch?

[ghost]

@zardus sorry, forgot about Ubuntu users :p
Now it's fixed!

[zardus]

Thank you :-)