giotypefuncs test: tweak _get_type() regexp
giotypefuncs test: tweak _get_type() regexp

Make sure that we only match the _get_type() function name by
restricting the regexp to matching [A-Za-z0-9_].  We were matching on .*
before which means that if we had two _get_type() functions appearing on
a single line then we would get everything in between them included (by
the default rule of '*' being greedy).

This affected G_DECLARE_*_TYPE which puts several uses of _get_type()
into a single line.

Distrotech/glib,Distrotech/glib,mzabaluev/glib,cention-sany/glib,tamaskenez/glib,tamaskenez/glib,johne53/MB3Glib,ieei/glib,krichter722/glib,krichter722/glib,MathieuDuponchelle/glib,ieei/glib,gale320/glib,tchakabam/glib,ieei/glib,lukasz-skalski/glib,lukasz-skalski/glib,johne53/MB3Glib,Distrotech/glib,mzabaluev/glib,MathieuDuponchelle/glib,johne53/MB3Glib,Distrotech/glib,cention-sany/glib,cention-sany/glib,Distrotech/glib,krichter722/glib,johne53/MB3Glib,mzabaluev/glib,lukasz-skalski/glib,gale320/glib,tamaskenez/glib,krichter722/glib,endlessm/glib,gale320/glib,johne53/MB3Glib,ieei/glib,MathieuDuponchelle/glib,tchakabam/glib,MathieuDuponchelle/glib,mzabaluev/glib,tchakabam/glib,krichter722/glib,endlessm/glib,tamaskenez/glib,ieei/glib,tchakabam/glib,gale320/glib,mzabaluev/glib,johne53/MB3Glib,lukasz-skalski/glib,endlessm/glib,cention-sany/glib,endlessm/glib,endlessm/glib,gale320/glib,tamaskenez/glib,tchakabam/glib,lukasz-skalski/glib,cention-sany/glib,MathieuDuponchelle/glib