[bootlin/training-materials] bc3d9e: yocto-first-build-stm32: install libssl-dev

[Alexandre Belloni]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: bc3d9e74132aa5a2ee11057d4fe1339d70fe2c2e
      https://github.com/bootlin/training-materials/commit/bc3d9e74132aa5a2ee11057d4fe1339d70fe2c2e
  Author: Alexandre Belloni <alexandre.belloni at bootlin.com>
  Date:   2022-10-03 (Mon, 03 Oct 2022)

  Changed paths:
    M labs/yocto-first-build-stm32/yocto-first-build-stm32.tex

  Log Message:
  -----------
  yocto-first-build-stm32: install libssl-dev

atf-tools-native is missing a dependency and expects openssl dev to be
installed on the host

Signed-off-by: Alexandre Belloni <alexandre.belloni at bootlin.com>