Provide a user level locking mechanism for FFTW #314

Job	Run time
prepare	2s
Build with Pip (ubuntu-22.04, 3.8, llvm, -march=native)	1m 6s
Build with Pip (ubuntu-22.04, 3.8, llvm, -march=x86-64)	1m 11s
Build with Pip (ubuntu-22.04, 3.8, gcc, -march=native)	57s
Build with Pip (ubuntu-22.04, 3.8, gcc, -march=x86-64)	49s
Build with Pip (ubuntu-22.04, 3.11, llvm, -march=native)	1m 15s
Build with Pip (ubuntu-22.04, 3.11, llvm, -march=x86-64)	1m 3s
Build with Pip (ubuntu-22.04, 3.11, gcc, -march=native)	47s
Build with Pip (ubuntu-22.04, 3.11, gcc, -march=x86-64)	50s
Build with Pip (windows-2022, 3.8, msvc, /arch:AVX2)	11m 48s
Build with Pip (windows-2022, 3.8, msvc, /arch:SSE2)	11m 31s
Build with Pip (windows-2022, 3.8, llvm, /arch:AVX2)	4m 20s
Build with Pip (windows-2022, 3.8, llvm, /arch:SSE2)	4m 41s
Build with Pip (windows-2022, 3.11, msvc, /arch:AVX2)	11m 17s
Build with Pip (windows-2022, 3.11, msvc, /arch:SSE2)	12m 31s
Build with Pip (windows-2022, 3.11, llvm, /arch:AVX2)	4m 43s
Build with Pip (windows-2022, 3.11, llvm, /arch:SSE2)	5m 40s
Build with Pip (macos-13, 3.8, llvm, -march=native)	3m 5s
Build with Pip (macos-13, 3.8, llvm, -march=x86-64)	3m 35s
Build with Pip (macos-13, 3.8, gcc-14, -march=native)	1m 36s
Build with Pip (macos-13, 3.8, gcc-14, -march=x86-64)	1m 27s
Build with Pip (macos-13, 3.11, llvm, -march=native)	5m 7s
Build with Pip (macos-13, 3.11, llvm, -march=x86-64)	4m 27s
Build with Pip (macos-13, 3.11, gcc-14, -march=native)	2m 32s
Build with Pip (macos-13, 3.11, gcc-14, -march=x86-64)	2m 7s
	1h 38m 27s

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