Changes

0.9.1

(backwards incompatible) Add CMake cache variable BUILD_SHARED_LIBS. The default is a static library for mobile (Android and iOS), and a shared library otherwise; that is the same pattern followed by opencv. The variable should be explicitly set to ON if a shared library must be created, and OFF if a static library must be created.
Use GoogleTest 1.14.0 and enable tests only when C++14 compiler available.
Support building into shared libraries on Windows:
extraheader attribute: Extra #include <stdio.h> or any other preprocessor statements in auto-generated header file.
extendedattribute attribute: Text in front of auto-generated functions, like __declspec(dllexport)

Forked to the DkML repository on GitLab.
Use binary mode when reading schemas on Windows
Use SSIZE_T from BaseTsd.h to allow MSVC to compile with 32-bits
Put alignment on segment fields, not just the structure.
Avoids left shifts of signed integers, which is undefined C behavior. Passes ASAN (not a false positive)
Wrap macro parameters in the capnp_use(x) macro. Passes clang-tidy (not a false positive)
Add POSITION_INDEPENDENT_CODE to CapnC::Runtime
Add C_CAPNPROTO_ENABLE_INSTALL with default ON to turn off and on installation of targets and files in cmake --install, especially for when this project is used within a FetchContent() command.

Fork of c-capnproto-0.3 plus several untagged commits from https://github.com/opensourcerouting/c-capnproto on Apr 23, 2023. Specifically: 632f0d73a1