Pkgconf

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

* This is the last planned maintenance branch. I see pkgconf as basically
a finished tool at this point, and very few people were ultimately interested
in libpkgconf. So, from here on out, it will just be bug fixes only and
very minor enhancements.

* Bug fixes:
- Improved path handling on Windows to conform to what the MSYS2
and Cygwin teams were already modifying pkgconf to do.
Patches by Christoph Reiter.
- Fix a minor memory leak relating to cross-personalities.
Patch by Stone Tickle.
- Fix static builds for Windows on Meson.
Patch by Alexander Neumann.
- Fix some edge cases with --redefine-prefix.
Patch by midipix.
- Do not prepend sysroot_dir if the .pc file does not exist in the
sysroot.
Patch by Sandro Mani.
- Do not perform path filtering on default system include and library
path lists. This fixes consistency with other mechanisms that modify
these path lists.

* Enhancements:
- Document the --validate option in the manpage.
Patch by orbea.

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

* Bug fixes:
- Fix null-dereference crash when pulling a malformed 'uninstalled'
.pc file into a dependency tree. Patch by Tobias Stöckmann.
- Fix truncation of comment characters when quoted.
- Fix handling of .pc module names in --list-all on Windows.
Patch by Ryan Scott.
- Handle platforms where realpath(3) requires a pre-allocated buffer.
Patch by Fabian Groffen.
- Fix version whitespace warning.
Patch by Christoph Reiter.

* Enhancements:
- Rewrite DOS paths on native Windows builds that don't use
Cygwin/MSYS.
- Add WantDefaultPure cross-compiler personality option.
- Prefer --static --pure linking on Windows.
- Add PKG_CONFIG_DONT_DEFINE_PREFIX environment variable.
Patch by Jeff Moguillansky.
- Many improvements when building pkgconf with Meson.
Patches by Christoph Reiter.

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

* Bug fixes:
- Fix a possible out of boundary write when evaluating dependencies.
Patch by Tobias Stöckmann.
- Fix escaping logic on Windows. Patch by Vincent Torri.
- Fix out of boundary reads and writes with a malformed fragment.
Patches by Tobias Stöckmann.
- Fix a possible out of boundary write when evaluating tuples.
Patch by Tobias Stöckmann.

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

* Bug fixes:
- Fix a windows-specific crash relating to path fixups.

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

* Bug fixes:
- Fix a possible out of boundary access in the parser for the
cross-compile database. Patch by Tobias Stöckmann.
- Missing files for building with Meson are now included in the
tarball. Patch by Neal Gompa.
- Fix calculation of package atoms on Windows with paths that
use both directory separator characters.

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

* 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.