infra build: revise the binding builds.

The thorvg lib should not have a dependency on the bindings.
In fact, it's inverted.

meson_options.txt

@@ -25,7 +25,7 @@ option('bindings',
    type: 'array',
    choices: ['', 'capi'],
    value: [''],
-   description: 'Enable C API binding')
+   description: 'Enable API bindings')
 
 option('tools',
    type: 'array',

src/bindings/capi/meson.build

@@ -2,7 +2,7 @@ source_file = [
    'tvgCapi.cpp',
 ]
 
-subbinding_dep += [declare_dependency(
+thorvg_lib_dep += [declare_dependency(
     include_directories : include_directories('.'),
     sources : source_file
 )]

src/bindings/meson.build

@@ -1,10 +1,3 @@
-subbinding_dep = []
-
 if get_option('bindings').contains('capi') == true
     subdir('capi')
 endif
-
-binding_dep = declare_dependency(
-   dependencies: subbinding_dep,
-   include_directories : include_directories('.'),
-)

src/meson.build

@@ -40,14 +40,15 @@ endif
 subdir('lib')
 subdir('loaders')
 subdir('savers')
-subdir('bindings')
 
-thorvg_lib_dep = [common_dep, loader_dep, saver_dep, binding_dep]
+thorvg_lib_dep = [common_dep, loader_dep, saver_dep]
 if host_machine.system() != 'windows'
     thread_dep = meson.get_compiler('cpp').find_library('pthread')
     thorvg_lib_dep += [thread_dep]
 endif
 
+subdir('bindings')
+
 thorvg_lib = library(
     'thorvg',
     include_directories    : headers,