plugins: allow plugins to be enabled on windows

allow plugins to be enabled in the configure script on windows. Also,
add the qemu_plugin_api.lib to the installer.

Signed-off-by: Greg Manning <gmanning@rapitasystems.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20231102172053.17692-5-gmanning@rapitasystems.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
[AJB: add check for dlltool to configure]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20231106185112.2755262-17-alex.bennee@linaro.org>

configure

@@ -1011,9 +1011,9 @@ if test "$targetos" = "bogus"; then
 fi
 
 # test for any invalid configuration combinations
-if test "$targetos" = "windows"; then
+if test "$targetos" = "windows" && ! has "$dlltool"; then
   if test "$plugins" = "yes"; then
-    error_exit "TCG plugins not currently supported on Windows platforms"
+    error_exit "TCG plugins requires dlltool to build on Windows platforms"
   fi
   plugins="no"
 fi

meson.build

@@ -3944,6 +3944,11 @@ endforeach
 
 if get_option('plugins')
   install_headers('include/qemu/qemu-plugin.h')
+  if targetos == 'windows'
+    # On windows, we want to deliver the qemu_plugin_api.lib file in the qemu installer,
+    # so that plugin authors can compile against it.
+    install_data(win32_qemu_plugin_api_lib, install_dir: 'lib')
+  endif
 endif
 
 subdir('qga')