build: add which command to build requirements
`which` utility is not shipped by default for example on recent Arch Linux and then any steps relying on its presence fails, like for example following Python3 prereq build check: $ python3 --version Python 3.9.1 $ make /bin/sh: line 1: which: command not found ... Checking 'python3'... failed. So make `which` utility host build requirement. References: PR#3820 FS#3525 Signed-off-by: Petr Štetiar <ynezz@true.cz> (cherry picked from commit 13069b1a1dcbef0bb9b42db98025fa9203283220)
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