make sure configure fails if AC_CHECK_ALIGNOF cannot detect the alignment
make sure configure fails if AC_CHECK_ALIGNOF cannot detect the alignment

When cross-compiling with gcc >= 4.5 AC_CHECK_ALIGNOF fails to detect the
correct alignment. Without a previous AC_CHECK_TYPE for the same type, the
alignment is silently set to '0'.
This makes sure that configure fails and reports the problem.

Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>

https://bugzilla.gnome.org/show_bug.cgi?id=674483

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