in e97fc89e7b a dependency on host-gcc >= 7 was added but
for the comment the condition was not correctly inverted.
Fixes: e97fc89e7b ("package/protobuf-c: bump to version 1.5.0")
Signed-off-by: Michael Nosthoff <buildroot@heine.tech>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>