Add support for automake 1.13
Add support for automake 1.13

Since automake 1.13, the macro AM_CONFIG_HEADER is deprecated and it has
to be replaced with AC_CONFIG_HEADERS, in order to build f-spot with automake
1.13.

-- Rafael Ferreira

mans0954/f-spot,mans0954/f-spot,mans0954/f-spot,dkoeb/f-spot,Sanva/f-spot,dkoeb/f-spot,mono/f-spot,mans0954/f-spot,mans0954/f-spot,mans0954/f-spot,NguyenMatthieu/f-spot,Yetangitu/f-spot,Sanva/f-spot,dkoeb/f-spot,mono/f-spot,mono/f-spot,NguyenMatthieu/f-spot,dkoeb/f-spot,Yetangitu/f-spot,Sanva/f-spot,Sanva/f-spot,NguyenMatthieu/f-spot,mono/f-spot,dkoeb/f-spot,Yetangitu/f-spot,Yetangitu/f-spot,Sanva/f-spot,NguyenMatthieu/f-spot,mono/f-spot,Yetangitu/f-spot,dkoeb/f-spot,NguyenMatthieu/f-spot,mono/f-spot