meson: unbreak cxx header installation

Summary:
before we had *correct* fileds in the subdir: keyword. However,
install_dir: was wrong, so *this* time, this seems right.

Reviewers: cedric, zmike, segfaultxavi, raster

Reviewed By: zmike

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D8634

src/bindings/cxx/efl_cxx/meson.build

@@ -1,5 +1,5 @@
 cxx_header_src += join_paths(file_location, 'Efl.hh')
 
 install_headers(join_paths('..', file_location, 'cxx', 'efl_part_impl.hh'),
-  subdir: join_paths(dir_package_include, 'cxx')
+  subdir: join_paths(package_version_name, 'cxx')
 )

src/bindings/cxx/eina_cxx/meson.build

@@ -50,5 +50,5 @@ eina_cxx = declare_dependency(
 )
 
 install_headers(eina_cxx_header_src,
-  subdir: dir_package_include
+  subdir: package_version_name
 )

src/bindings/cxx/meson.build

@@ -30,7 +30,6 @@ foreach lib : cxx_sublibs
     '-DNEED_RUN_IN_TREE=1'
   ]
 
-  dir_package_include = package_version_name
   dir_package_modules = join_paths(dir_lib, package_name, 'modules')
   cxx_generator_target = []
   cxx_header_src = []
@@ -50,7 +49,7 @@ foreach lib : cxx_sublibs
         input : join_paths(subdir_file_location, cxx_gen_file),
         output : [cxx_gen_file + '.hh', cxx_gen_file + '.impl.hh'],
         install : true,
-        install_dir : join_paths(dir_package_include, eo_file_subdir),
+        install_dir : join_paths(dir_include, package_version_name, eo_file_subdir),
         command : [eolian_cxx_gen, '-I', meson.current_source_dir(), eolian_include_directories,
                                    '-o', join_paths(meson.current_build_dir(), cxx_gen_file + '.hh'),
                                    '@INPUT@'])
@@ -64,7 +63,7 @@ foreach lib : cxx_sublibs
           input : eo_file_list,
           output : [lib[0] + '.eo.hh'],
           install : true,
-          install_dir : join_paths(dir_package_include),
+          install_dir : join_paths(dir_include, package_version_name),
           command : [eolian_cxx_gen, '-I', meson.current_source_dir(), eolian_include_directories, '-m',
                                      '-o', '@OUTPUT@',
                                      '@INPUT@'])
@@ -97,7 +96,7 @@ foreach lib : cxx_sublibs
   endforeach
 
   install_headers(cxx_header_src,
-    subdir: dir_package_include
+    subdir: package_version_name,
   )
 
   pkgconfig.generate(