From: Stephane Marchesin
Subject: Re: [SDL] 3DNow! detection on a P4 system

Well... I found another bug : 3dnow was detected on P2/P3 cpus. So I
took one more look at the code and found a mistake in
CPU_getCPUIDFeaturesExt :
The condition for having extended cpuinfo is that when we query extended
cpuinfo we get a result >=  0x80000001. So we must exit if eax < 0x80000001.
The attached patch does that.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40788