build: never install cmocka

meson's default behavior is to install subprojects, so because we use a
wrap to get cmocka if needed and the cmocka wrap sets install=true
unless cross-compiling, cmocka headers and libraries will be installed
by `meson install`. This isn't useful (because cmocka is used only for
tests which don't get installed), and can cause install errors in some
configurations.

meson can be told to never install subprojects with `meson install
--skip-subprojects` which solves this, but is inconvenient because that
option must be specified on the command line and there is little hope of
meson's default behavior changing [1].

To fix this, I've replaced `patch_url` for the wrap with an included
`patch_directory` instead, which was created by unpacking the original
archive pointed to by `patch_url` and setting `install : false` in
src/meson.build.

A more concise option to make the same change would be to make the
change to the `install` option in a new patch specified via `diff_files`
(which works because patches from `diff_files` are applied after
applying the `patch_*` archive), but `diff_files` is not supported by
Meson before version 0.63.0 which would require increasing flashrom's
minimum meson version from the current 0.56.0. This seems too new, since
meson 0.56 was released in October 2020 while meson 0.63 was released in
July 2022.

[1]: https://github.com/mesonbuild/meson/issues/10561#issuecomment-1444059473

BUG=https://ticket.coreboot.org/issues/561

Change-Id: I15f549175e2d5d52979814d7f7530da868871ce8
Signed-off-by: Peter Marheine <pmarheine@chromium.org>
---
M subprojects/cmocka.wrap
A subprojects/packagefiles/cmocka-1.1.5/LICENSE.build
A subprojects/packagefiles/cmocka-1.1.5/meson.build
A subprojects/packagefiles/cmocka-1.1.5/private/meson.build
A subprojects/packagefiles/cmocka-1.1.5/private_native/meson.build
A subprojects/packagefiles/cmocka-1.1.5/src/meson.build
6 files changed, 325 insertions(+), 3 deletions(-)