6.5.2 broken on alpha/Tru64 Unix 4.0d/cc

Hi, all.

Someone has changed the "#if defined(__alpha)" tests that existed in
include/storage/s_lock.h in 6.5.1 to "#if defined(__alpha__)". The problem
is that DEC (¿Compaq?) C only defines __alpha, (gcc defines both __alpha
and __alpha__) so it doesn't work anymore.

In fact, there are two places where the test is used, one inside a "#if
defined(__GNUC__)" and the other one inside the corresponding "#else". It
seems that the easiest sollution is to change the check inside the "#else"
back to "#if defined(__alpha)".

Cheers,

	Pedro.

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