Rewritten 808x CPU emulation core based on reenigne's XTCE, VisiOn, SnatchIt, and 8088 MPH now work correctly;

Fixed PC speaker sound volume in PIT mode 0;
A few CPU emulation clean-ups;
Hard disk controller changing redone in a less messy way;
Re-added the long-missing key send delay handling to the XT keyboard handler;
Fixed a bug that was causing SLiRP not to work when compiled with MingW/GCC 7.3.0-2 or newer;
Some serial mouse and port fixes;
A lot of changes to printer emulation, mostly based on DOSBox-X;
Printer PNG writer now uses statically linked libpng;
Added support for the HxC MFM floppy image format and upped 86F format version to 2.12;
Ported various things from PCem and some from VARCem;
Added the S3 86c801/805 emulation (patch from TheCollector1995);
Fixed and renamed the EGA monitor options;
Better synchronized the 808x to the PIT and the CGA;
Fixed the CGA wait state calculation;
Cleaned up some things in mem.c;
Fixed some things in the floppy emulation to make VisiOn get the correct errors from the copy protection disk;
Fixed several renderer-related bugs, including the SDL2 renderer's failure to take screenshots;
The Jenkins builds are now compiled with MingW/GCC 7.4.0-1 and include all the required DLL's.

src/cpu/x86seg.c

@@ -8,7 +8,7 @@
  *
  *		x86 CPU segment emulation.
  *
- * Version:	@(#)x86seg.c	1.0.8	2018/10/17
+ * Version:	@(#)x86seg.c	1.0.9	2018/11/14
  *
  * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
  *		Miran Grca, <mgrca8@gmail.com>
@@ -46,7 +46,7 @@ int dtimes = 0;
 int btimes = 0;
 
 uint32_t abrt_error;
-int cgate16,cgate32;
+int cgate16, cgate32;
 
 #define breaknullsegs 0
 
@@ -55,7 +55,6 @@ int intgatesize;
 void taskswitch286(uint16_t seg, uint16_t *segdat, int is32);
 void taskswitch386(uint16_t seg, uint16_t *segdat);
 
-int output;
 void pmodeint(int num, int soft);
 /*NOT PRESENT is INT 0B
   GPF is INT 0D*/
@@ -89,7 +88,9 @@ void x86abort(const char *format, ...)
    va_end(ap);
    fflush(stdlog);
    nvr_save();
+#ifdef ENABLE_808X_LOG
    dumpregs(1);
+#endif
    fflush(stdlog);
    exit(-1);
 }