Small but important video changes of the day (October 27th, 2024)

8514/A compatibles:
1. The mode switch (from VGA to 8514/A/ATI and vice-versa) has been fixed again (for the Nth time).
2. Removed a pattern hack used on DPCONFIG = 0x5211 on bitblt, now patterns work properly using the ATI Mach8 3.0 win3.1x drivers.
3. Clipping regs are more accurate for acceleration.

XGA 1-2:
A picky OS is a picky OS, fixes to the Win95 fonts (which uses the pattern sources) applied.

src/include/86box/vid_8514a.h

@@ -198,13 +198,16 @@ typedef struct ibm8514_t {
     int     hsync_width;
     int     htotal;
     int     hdisp;
+    int     hdisp2;
     int     hdisped;
     int     sc;
     int     vsyncstart;
     int     vsyncwidth;
     int     vtotal;
     int     v_disp;
+    int     v_disp2;
     int     vdisp;
+    int     vdisp2;
     int     disp_cntl;
     int     interlace;
     uint8_t subsys_cntl;