Provide a user level locking mechanism for FFTW (#548) #343

Job	Run time
prepare	4s
Build with Pip (ubuntu-22.04, 3.8, llvm, -march=native)	1m 11s
Build with Pip (ubuntu-22.04, 3.8, llvm, -march=x86-64)	1m 4s
Build with Pip (ubuntu-22.04, 3.8, gcc, -march=native)	53s
Build with Pip (ubuntu-22.04, 3.8, gcc, -march=x86-64)	1m 1s
Build with Pip (ubuntu-22.04, 3.11, llvm, -march=native)	1m 7s
Build with Pip (ubuntu-22.04, 3.11, llvm, -march=x86-64)	1m 0s
Build with Pip (ubuntu-22.04, 3.11, gcc, -march=native)	50s
Build with Pip (ubuntu-22.04, 3.11, gcc, -march=x86-64)	50s
Build with Pip (windows-2022, 3.8, msvc, /arch:AVX2)	11m 37s
Build with Pip (windows-2022, 3.8, msvc, /arch:SSE2)	11m 51s
Build with Pip (windows-2022, 3.8, llvm, /arch:AVX2)	4m 18s
Build with Pip (windows-2022, 3.8, llvm, /arch:SSE2)	4m 12s
Build with Pip (windows-2022, 3.11, msvc, /arch:AVX2)	11m 41s
Build with Pip (windows-2022, 3.11, msvc, /arch:SSE2)	11m 55s
Build with Pip (windows-2022, 3.11, llvm, /arch:AVX2)	4m 36s
Build with Pip (windows-2022, 3.11, llvm, /arch:SSE2)	4m 20s
Build with Pip (macos-13, 3.8, llvm, -march=native)	3m 44s
Build with Pip (macos-13, 3.8, llvm, -march=x86-64)	3m 10s
Build with Pip (macos-13, 3.8, gcc-14, -march=native)	2m 9s
Build with Pip (macos-13, 3.8, gcc-14, -march=x86-64)	1m 29s
Build with Pip (macos-13, 3.11, llvm, -march=native)	3m 25s
Build with Pip (macos-13, 3.11, llvm, -march=x86-64)	3m 34s
Build with Pip (macos-13, 3.11, gcc-14, -march=native)	1m 58s
Build with Pip (macos-13, 3.11, gcc-14, -march=x86-64)	2m 17s
	1h 34m 16s

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