C99 compatibility fixes #82
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This avoids build failures with future compilers which do not support implicit function declarations.
As a result, the function input_error is declared. This avoids a build failure with future compilers which do not support implicit function declarations.
This avoids build failures with future compilers which do not support implicit ints.
Having getopt() in unistd.h is a GNU extension, with -std=c99 or c11 the user is warned about its implicit declaration.
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Improving the merge request from @fweimer-rh.
Supersedes #76