libsupport: fix compilation on RHEL 5.x due to missing magic define

RHEL 5.x does have magic.h, but it does not define all expected symbols. In
particular, the NO_CHECK symbols were only added in file 4.20 and RHEL 5.x
is using 4.17.

Add substitute defines to allow continued usage of magic but without the
requested exclude checks.

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
1 file changed