cmake: Add cross docs

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+## CMake subproject cross compilation support
+
+Meson now supports cross compilation for CMake subprojects. Meson will try to
+automatically guess most of the required CMake toolchain variables from existing
+entries in the cross and native files. These variables will be stored in an
+automatically generate CMake toolchain file in the build directory. The
+remaining variables that can't be guessed can be added by the user in the
+new `[cmake]` cross/native file section.