Prefer %global over %define

As Fedora Package Guidelines say:

    https://fedoraproject.org/wiki/Packaging:Guidelines#.25global_preferred_over_.25define

packaging/template.spec

-%define sfincb %{_datadir}/shellfu/include-bash
-%define sfmodn __SHELLFU_MODNAME__
-%define shellfu_req shellfu >= 0.10.4, shellfu < 0.11
+%global sfincb %{_datadir}/shellfu/include-bash
+%global sfmodn __SHELLFU_MODNAME__
+%global shellfu_req shellfu >= 0.10.4, shellfu < 0.11
 
 Name:       __MKIT_PROJ_PKGNAME__
 Version:    __MKIT_PROJ_VERSION__