meson: Support building boost as subproject

Add support for the local meson build on the system without boost.

Tested:
"meson setup build && cd build && meson compile" finishes successfully.

Chang

meson: Support building boost as subproject

Add support for the local meson build on the system without boost.

Tested:
"meson setup build && cd build && meson compile" finishes successfully.

Change-Id: I22eb23c216f9333589ab61ae4d1cb707be5c9a0a
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>

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