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build: fix inability to detect correct python command in configure

Rodrigo Muino Tomonari requested to merge github/fork/eli-schwartz/command-v-portability into master

The "which" utility is not guaranteed to be installed, and if it is, its behavior is not portable.

Conversely, the "command -v" shell builtin is required to exist in all POSIX 2008 compliant shells, and is thus guaranteed to work everywhere.

Examples of open-source shells likely to be installed as /bin/sh on Linux, which implement the 12-year-old standard: ash, bash, busybox, dash, ksh, mksh and zsh.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines

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