More stable workaround for MinGW _ftelli64() issue #1339

Job	Run time
🔨 MSVC x64 glib	2m 22s
🔨 MSVC x86 glib	2m 19s
🔧 MinGW fluidsynth-mingw x86	1m 29s
🔧 MinGW fluidsynth-mingw x64	2m 18s
🔧 MSVC Additional (osal_cpp11)	2m 4s
🔧 MSVC Additional (minimal)	2m 39s
🔧 MSVC Additional (no_network)	2m 1s
🔧 MSVC Additional (default)	2m 3s
🔨 MSVC x86 cpp11	3m 2s
🔧 MSVC Additional (debug_prof)	2m 7s
🔧 MinGW fluidsynth-mingw-ffloat-store x86	1m 37s
🔨 MSVC x64 cpp11	2m 13s
🔧 MinGW fluidsynth-mingw2 x86	1m 35s
🚧⬛ mingw32 cpp11	3m 29s
🔧 MinGW fluidsynth-mingw1 x86	3m 20s
🚧🟨 ucrt64 glib	3m 25s
🚧🟧 clang64 cpp11	3m 5s
🚧⬛ mingw32 glib	3m 16s
🔧 MSVC Additional (static_lib)	2m 39s
🔧 MinGW fluidsynth-mingw-static x64	2m 10s
🚧🟦 mingw64 cpp11	3m 31s
🚧🟧 clang64 glib	2m 41s
🚧🟨 ucrt64 cpp11	2m 19s
🚧🟦 mingw64 glib	2m 13s
🧪 Acceptance Test	1s
🚀 Publish Release Artifacts	1s
📢 Announce Release	1s
	1h 0m 0s

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