add autogenerated C code for Becke routines #23

Job	Run time
Test ubuntu-latest / 3.8 / Cython true / venv	58s
Test ubuntu-latest / 3.8 / Cython false / conda	1m 4s
Test ubuntu-latest / 3.9 / Cython true / venv	59s
Test ubuntu-latest / 3.9 / Cython false / conda	1m 9s
Test ubuntu-latest / 3.10 / Cython true / venv	1m 0s
Test ubuntu-latest / 3.10 / Cython false / conda	1m 5s
Test ubuntu-latest / 3.11 / Cython true / venv	54s
Test ubuntu-latest / 3.11 / Cython false / conda	1m 5s
Test macos-latest / 3.8 / Cython false / venv	1m 47s
Test macos-latest / 3.8 / Cython true / conda	2m 58s
Test macos-latest / 3.9 / Cython false / venv	1m 14s
Test macos-latest / 3.9 / Cython true / conda	2m 27s
Test macos-latest / 3.10 / Cython false / venv	1m 29s
Test macos-latest / 3.10 / Cython true / conda	1m 57s
Test macos-latest / 3.11 / Cython false / venv	1m 40s
Test macos-latest / 3.11 / Cython true / conda	2m 2s
	23m 48s

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