Add FAKE_VALUE_FUNC_VARLIST and FAKE_VOID_FUNC_VARLIST macros

[sung-gon-kim]

These macros allow to create fake functions that take a va_list as the last argument.
Other than that, they behave identically to the FAKE_VALUE_FUNC_VARARG and FAKE_VOID_FUNC_VARARG macros.

These macros can be used as follows:

FAKE_VALUE_FUNC_VARLIST(int, vfprintf, FILE*, va_list)

• Your code builds clean without any errors or warnings
• You are not breaking consistency
• You have added unit tests
• All tests and other checks pass