Pkgconf

----------------------------

* Bug fixes:
- Fix a possible buffer overflow involving newline escaping.
Patch by Tobias Stöckmann.
- Fix an out of boundary access in the parser.
Patch by Tobias Stöckmann.
- Fix leakage of strcmp() result value in pkgconf_compare_version()
responses.
- Return the default personality if loading a cross-compile
personality file failed.
- Do not complain about newlines when validating package versions.
- Properly detect strndup() on Windows when building with Meson.

* Enhancements:
- A new --shared option and WantDefaultStatic cross-compile
configuration option have been added. This allows for toolchains
to specify that static linking should be used by default.
- Support for the PKG_CONFIG_MSVC_SYNTAX environment variable has
been added. Patch by Dan Kegel.
- Support for the PKGCONF_PKG_PKGF_DONT_MERGE_SPECIAL_FRAGMENTS
client flag which disables emulation of freedesktop.org pkg-config
fragment merging semantics has been added.
Patch by Karen Arutyunov.

----------------------------

* Bug fixes:
- Properly tokenize versions. Versions cannot logically contain
whitespace, as dependency-lists would not properly tokenize if
they could. A diagnostic is generated for malformed version
strings containing whitespace when --validate is used.

* Enhancements:
- CMake support has been dropped. Use Meson to build on Windows.

----------------------------

* Bug fixes:
- Fixed a memory leak when deduplicating paths.
- Fixed strndup-related build regression on Windows.

* Enhancements:
- Added pkgconf-lite variant. pkgconf-lite is a stripped down
variant of pkgconf that only includes pkg-config features.
- Added --modversion description to pkgconf(1) man page.

----------------------------

* Bug fixes:
- Fixed an issue where a personality may not be properly selected
due to argv[0] containing a full path.
- Fixed a regression where having an empty PKG_CONFIG_LIBDIR
environment variable would not eliminate the default search
paths.
- Use POSIX realpath(3) instead of readlink() for deduplicating the
search path. Use _fullpath() on Windows for the same purpose.
- The dequoting logic for tuples has been improved to ensure that
quotes *inside* a value remain quoted when necessary.

----------------------------

* Bug fixes:
- Fixed issue where packages which referenced missing packages in
Requires.private may have crashed due to memory corruption issues
in some circumstances.
- Fixed warnings reported by GCC 8 diagnostics.

* Enhancements:
- Add LIBPKGCONF_VERSION and LIBPKGCONF_VERSION_STR macros for
determining libpkgconf version.
- Add pkgconf_fragment_copy_list() to copy a fragment list to
another fragment list.

----------------------------

* Bug fixes:
- fix build on Windows with Meson
- fix edge cases for path canonicalization (especially on Windows)