meson: remove cmake config and fix pkgconfig

exiv2lib_export.h in meson is implemented as an empty file and the
EXIVAPI definitions are handled by passing -D to the compiler. Add it to
the pkgconf file to make it work.

For cmake configuration, there's no easy way to handle this. Because
meson's support is limited, a full blown cmake configuration file needs
to be written for this purpose.

Instead of trying to make it work, simpler to remove and tell people to
use pkgconfig.

Signed-off-by: Rosen Penev <[email protected]>

Author: neheb

src/meson.build

@@ -116,17 +116,12 @@ if host_machine.system() == 'windows' and get_option('default_library') != 'stat
   dllapi = '-DEXIV2API=__declspec(dllimport)'
 endif
 
-cmake = import('cmake')
-cmake.write_basic_package_version_file(
-  name: meson.project_name(),
-  version: meson.project_version(),
-)
-
 pkg = import('pkgconfig')
 pkg.generate(
   exiv2,
   description: 'Exif/IPTC/Xmp C++ metadata library and tools plus ICC Profiles, Previews and more.',
   url: 'https://exiv2.org',
+  extra_cflags: dllapi,
 )
 
 exiv2_dep = declare_dependency(