Revert "Don't go through D_DrawSpans function pointer"

This reverts commit ef378240ca8c64a8823be28f2bf756256e605aac.
Revert "Don't go through pdrawfunc function pointer anymore - seems to give"

This reverts commit e4eec06f9f89faaed6892c6fc793130b72474698.
Revert "Ifdef 0 stuff out that is not used for the libretro port"

This reverts commit 935517e1ce3bc95c022725fbf714c855b0a1cbf4.
Revert "auxedges unused - ifdef 0"

This reverts commit b1b39cdb93b00c5046443f8f705b4c084b9a6b0c.
Revert "Comment out snd_show branch"

This reverts commit 2656d0ee697770c229dcb6906ceacca5f51aa42f.
Revert "Comment out host_speeds"

This reverts commit 14f5437802e2ad2ba8823f3e30f9a86b4733226e.
Revert "Don't do S_ExtraUpdate everywhere - we don't want 'extra sound updating'"

This reverts commit 88798aeb1c78dc28b1b00f30da081cd1226d80a4.

Conflicts:
	common/sys_libretro.c