Provide a user level locking mechanism for FFTW #342

Job	Run time
prepare	2s
Build with Pip (ubuntu-22.04, 3.8, llvm, -march=native)	1m 28s
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)	55s
Build with Pip (ubuntu-22.04, 3.8, gcc, -march=x86-64)	54s
Build with Pip (ubuntu-22.04, 3.11, llvm, -march=native)	1m 27s
Build with Pip (ubuntu-22.04, 3.11, llvm, -march=x86-64)	1m 57s
Build with Pip (ubuntu-22.04, 3.11, gcc, -march=native)	49s
Build with Pip (ubuntu-22.04, 3.11, gcc, -march=x86-64)	1m 17s
Build with Pip (windows-2022, 3.8, msvc, /arch:AVX2)	13m 25s
Build with Pip (windows-2022, 3.8, msvc, /arch:SSE2)	12m 3s
Build with Pip (windows-2022, 3.8, llvm, /arch:AVX2)	4m 2s
Build with Pip (windows-2022, 3.8, llvm, /arch:SSE2)	4m 53s
Build with Pip (windows-2022, 3.11, msvc, /arch:AVX2)	11m 49s
Build with Pip (windows-2022, 3.11, msvc, /arch:SSE2)	12m 30s
Build with Pip (windows-2022, 3.11, llvm, /arch:AVX2)	4m 31s
Build with Pip (windows-2022, 3.11, llvm, /arch:SSE2)	5m 8s
Build with Pip (macos-13, 3.8, llvm, -march=native)	4m 3s
Build with Pip (macos-13, 3.8, llvm, -march=x86-64)	2m 44s
Build with Pip (macos-13, 3.8, gcc-14, -march=native)	1m 53s
Build with Pip (macos-13, 3.8, gcc-14, -march=x86-64)	1m 28s
Build with Pip (macos-13, 3.11, llvm, -march=native)	2m 57s
Build with Pip (macos-13, 3.11, llvm, -march=x86-64)	3m 6s
Build with Pip (macos-13, 3.11, gcc-14, -march=native)	1m 41s
Build with Pip (macos-13, 3.11, gcc-14, -march=x86-64)	1m 58s
	1h 38m 4s

Provide feedback