Merge pull request #5263 from Ericson2314/per-machine-cli-args

Per machine 'build_' and '' options

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+## Specifying options per mer machine
+
+Previously, no cross builds were controllable from the command line.
+Machine-specific options like the pkg-config path and compiler options only
+affected native targets, that is to say all targets in native builds, and
+`native: true` targets in cross builds. Now, prefix the option with `build.` to
+affect build machine targets, and leave it unprefixed to affect host machine
+targets.
+
+For those trying to ensure native and cross builds to the same platform produced
+the same result, the old way was frustrating because very different invocations
+were needed to affect the same targets, if it was possible at all. Now, the same
+command line arguments affect the same targets everwhere --- Meson is closer to
+ignoring whether the "overall" build is native or cross, and just caring about
+whether individual targets are for the build or host machines.