[pc] DosBox ECE

This build is based on the original SVN build of DOSBox but includes the following patches:

• Patch for more accurately balanced Soundblaster volumes, created by Qbix with help from James-F (https://www.vogons.org/viewtopic.php?f=32&t=52414&p=581137#p580918)
• Patch for 3dfx Voodoo emulation, created by kjliew (and originally by kekko and gulikoza) (https://www.vogons.org/viewtopic.php?f=32&t=42449)
• Patch for enhanced scalers (normal4x, normal5x, normal6x), created by VileRancour (https://www.vogons.org/viewtopic.php?f=41&t=43899)
• Patch for pixel perfect scaling, created by Ant_222 (https://www.vogons.org/viewtopic.php?f=32&t=49160). Please read the "README for pixel perfect patch.txt" file for instructions how to use these features!
• Patch for Nuked OPL3 emulation, created by nukeykt (https://www.vogons.org/viewtopic.php?f=41&t=49327).  Make sure to set the sample rate in the [mixer] and the [sblaster] section to 49716 and to set "oplemu=nuked" in the [sblaster] section as well!
• Patch for better playback using PC speaker, created by ripa (https://www.vogons.org/viewtopic.php?f=41&t=23371)
• Patch for integration of MT32emu from MUNT project, created by kingguppy, sergm (https://sourceforge.net/projects/munt/)
• Patch for integration of Fluidsynth MIDI Synthesizer, created by mgiuca / bloodbat / dugan (https://www.vogons.org/viewtopic.php?f=32&t=27831&start=20)
• Patch that enables support for up to ten joystick axis as well as the possibility to map the digipad (even when joysticktype=auto), created by cfoesch (https://www.vogons.org/viewtopic.php?f=32&t=27452)
• Patch that enables the mapping of mouse buttons to keyboard or controller buttons, created by Magnus Henoch (https://sourceforge.net/p/dosbox/patches/264/)
• Patch that enables separate sensitivity settings for the X and Y axis of the mouse, created by koob (https://sourceforge.net/p/dosbox/patches/276/)
•  Setting the vertical sensivity to zero practcally disables the Y axis, might be useful for some FPS games.
• Patch that improves support of mixed mode CD games and introduces the possibility to use ReDump images containing several .bin files, as well as support for FLAC, OPUS and MP3 files with CUEs, created by krcroft (https://www.vogons.org/viewtopic.php?f=41&t=62203)