plugin/pango: include common/globals.h in gvgetfontlist_pango.c

plugin/pango: include common/globals.h in gvgetfontlist_pango.c

An upcoming commit which enables code that uses the Verbose global
variable would otherwise cause this error:

gvgetfontlist_pango.obj : error LNK2019: unresolved external symbol _Verbose referenced in function _get_font_mapping [C:\GitLab-Runner\builds\magjac\graphviz\build\plugin\pango\gvplugin_pango.vcxproj]
C:\GitLab-Runner\builds\magjac\graphviz\build\plugin\pango\Release\gvplugin_pango.dll : fatal error LNK1120: 1 unresolved externals [C:\GitLab-Runner\builds\magjac\graphviz\build\plugin\pango\gvplugin_pango.vcxproj]