meson: Backport patches to support dependencies on header-only Boost libs

meson: Backport patches to support dependencies on header-only Boost libs

With Boost 1.89.0, the Boost.System library was made header-only. Since
this is a frequent library to have as dependency in meson.build files,
this resulted in build failures.

Backport two patches so that Boost dependencies on header-only libraries
work as expected.

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>