beremiz

fix license notices in source files and license files under GPLv2+

Previously a lot of files were referenced to GNU Public License 2.1,
which never existed.
All copyright attributions are kept the same.
int CheckRetainBuffer(void)
{
return 1;
}
void ValidateRetainBuffer(void)
{
}
void InValidateRetainBuffer(void)
{
}
void Retain(unsigned int offset, unsigned int count, void *p)
{
}
void Remind(unsigned int offset, unsigned int count, void *p)
{
}