Generate Android cross files with env2mfile.

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+## Android cross file generator
+
+The `env2mfile` command now supports a `--android` argument. When
+specified, it tells the cross file generator to create cross files for
+all Android toolchains located on the current machines.
+
+This typically creates many files, so the `-o` argument specifies the
+output directory. A typical use case goes like this:
+
+```
+meson env2mfile --android -o androidcross
+meson setup --cross-file \
+  androidcross/android-29.0.14033849-android35-aarch64-cross.txt \
+  builddir
+```