raise system requirements to Pentium3 so that we can force the math
pipeline to SSE, this fixes lightmap alignment issues in several
usermade quake maps (where the x87 increased precision was resulting in
different rounding than in the map compiler)

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12088 d7cf8633-e32d-0410-b094-e92efae38249
::stable-branch::merge=27508c2bb7671a9ddc486c4f379bae0d913a5836
Fix possible endless loop in VM_sprintf.

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12100 d7cf8633-e32d-0410-b094-e92efae38249
::stable-branch::merge=13906da312242ecc431c6a683b9b0b2c5e9d970c
In current gccs, it is -mfpmath=sse, not -fpmath=sse.

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12101 d7cf8633-e32d-0410-b094-e92efae38249
::stable-branch::merge=5c0645a1f9104431cd3d4722720d478ec6ecf194
Fix _alpha image loading.

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12102 d7cf8633-e32d-0410-b094-e92efae38249
::stable-branch::merge=6d56b5f88b61a8c3092d56efafabeaa12fdd8294