dev-embedded/u-boot-tools: Version bump to 2021.07

* Bump EAPI to 8
* Use https:// instead of ftp:// in SRC_URI
* Combine same build flags into myemakeargs
* Use toolchain-funcs to export BUILD_CC and
  set HOSTCC=${BUILD_CC}, which enables us
  to correctly cross-compile the package,
  otherwise the build system tries to use
  cross-compiler as HOSTCC
* Add USE=envtools that builds and installs
  only target-side environment tools which is
  useful for low storage situations where we only
  need envtools to read and modify U-Boot environment
  variables. This functionality matches the uboot-envtools
  package which is available in OpenWRT

Signed-off-by: Jakov Smolić <jsmolic@gentoo.org>

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