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Fix some rare race conditions reported by thread sanitizer #7

Job	Run time
Build VS 2022 (Installer), RelWithDebInfo, Win32	3m 22s
Build VS 2022 (Portable), Debug, Win32	1m 29s
Build VS 2022 (Portable), Debug, x64	2m 32s
Build VS 2022 (Portable), RelWithDebInfo, Win32	1m 43s
Build VS 2022 (Portable), RelWithDebInfo, x64	3m 18s
Build VS 2019 (Portable - WinXP), Debug, Win32	1m 22s
Build VS 2019 (Portable - WinXP), RelWithDebInfo, Win32	2m 43s
Build macOS (Portable), Debug, x86_64	2m 39s
Build macOS (Non-Portable), Debug, x86_64	2m 29s
Build Linux (Portable - ubuntu:16.04), Debug	1m 46s
Build macOS (Portable), Release, x86_64	2m 55s
Build Linux (Non-Portable - ubuntu:16.04), Debug	1m 44s
Build macOS (Non-Portable), Release, x86_64	3m 19s
Build Linux (Portable - ubuntu:16.04), Release	3m 12s
Build Linux (Non-Portable - ubuntu:16.04), Release	2m 53s
Build Linux (Portable - i386/ubuntu:16.04), Debug	1m 46s
Build Linux (Non-Portable - i386/ubuntu:16.04), Debug	1m 46s
Build Linux (Portable - i386/ubuntu:16.04), Release	2m 38s
Build Linux (Non-Portable - i386/ubuntu:16.04), Release	2m 22s
	45m 58s

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