pkgbase: add a mechanism to be able to force a give ucl include

This is made in order to be able to find add the post-install scripts
for the kernel, where PKGNAME varies for each KERNCONF but we don't want
to dynamically duplicated the kernel.ucl file.

At the same time we don't want the *-dbg* packages to actually include
those post-install scripts

Makefile.inc1

@@ -2258,6 +2258,8 @@ create-kernel-packages-extra-flavor${flavor:C,^""$,${_default_flavor},}-${_kerne
 	${SRCDIR}/release/packages/generate-ucl.lua \
 		PKGNAME "kernel-${_kernel:tl}${flavor}" \
 		PKGGENNAME "kernel" \
+		FORCEINCLUDE "kernel${flavor}" \
+		UCLFILES "${SRCDIR}/release/packages/" \
 		VERSION "${PKG_VERSION}" \
 		KERNELDIR "kernel.${_kernel}" \
 		DESC "FreeBSD ${_kernel} kernel ${flavor}" \

release/packages/template.ucl

@@ -16,3 +16,4 @@ ${DESC}
 EOD
 .include(try=true,duplicate=rewrite) "${UCLFILES}/${PKGGENNAME}-all.ucl"
 .include(try=true,duplicate=rewrite) "${UCLFILES}/${PKGNAME}.ucl"
+.include(try=true,duplicate=rewrite) "${UCLFILES}/${FORCEINCLUDE}.ucl"