build(meson): add non_blocking_getaddrinfo option (#2174)

This new option automatically enables the new non-blocking name
resolution when the appropriate libraries are found, automatically
adding them to the list of required dependencies. It will gracefully
fall back to the old behaviour when no library is found.

This complements commit ea850cbfa7.

meson.build

@@ -16,11 +16,12 @@ project(
   meson_version: '>=0.62.0'
 )
 
+cxx = meson.get_compiler('cpp')
+
 # Check just in case downstream decides to edit the source
 # and add a project version
 version = meson.project_version()
 if version == 'undefined'
-  cxx = meson.get_compiler('cpp')
   version = cxx.get_define('CPPHTTPLIB_VERSION',
     prefix: '#include <httplib.h>',
     include_directories: include_directories('.')).strip('"')
@@ -65,6 +66,21 @@ if brotli_found_all
   args += '-DCPPHTTPLIB_BROTLI_SUPPORT'
 endif
 
+async_ns_opt = get_option('cpp-httplib_non_blocking_getaddrinfo')
+
+if host_machine.system() == 'windows'
+  async_ns_dep = cxx.find_library('ws2_32', required: async_ns_opt)
+elif host_machine.system() == 'darwin'
+  async_ns_dep = dependency('appleframeworks', modules: ['CFNetwork'], required: async_ns_opt)
+else
+  async_ns_dep = cxx.find_library('anl', required: async_ns_opt)
+endif
+
+if async_ns_dep.found()
+  deps += async_ns_dep
+  args += '-DCPPHTTPLIB_USE_NON_BLOCKING_GETADDRINFO'
+endif
+
 cpp_httplib_dep = dependency('', required: false)
 
 if get_option('cpp-httplib_compile')