Don't define NOMINMAX if it's already defined

[Spekular]

Co-authored-by: Dominic Clark mrdomclark@gmail.com

[LmmsBot]

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Linux

• Linux (AppImage): lmms-1.2.3-705%2Bg92e13b0-linux-x86_64.AppImage (build link)

Windows

• Windows 32-bit: lmms-1.2.3-705%2Bg92e13b001-mingw-win32.exe (build link)
• Windows 64-bit: lmms-1.2.3-705%2Bg92e13b001-mingw-win64.exe (build link)
• Windows 32-bit: lmms-1.2.2-msvc2017-win32.exe (build link)
• Windows 64-bit: lmms-1.2.2-msvc2017-win64.exe (build link)
• Windows 32-bit: lmms-1.2.2-msvc2017-win32.exe (build link)
• Windows 64-bit: lmms-1.2.2-msvc2017-win64.exe (build link)

macOS

• macOS : lmms-1.2.3-705%2Bg92e13b001-mac10.13.dmg (build link)

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[Spekular]

Being eager to fix this CI error via direct commit just led to more CI errors, so let's go with a PR this time. Bypassing CI when attempting to fix CI was probably a dumb move...