More slimming, largely of variables.

Makefile

@@ -66,9 +66,7 @@ help:
 	@echo
 	@echo Other extensions are also supported:
 	@echo \ \* .repo: Generate a repo with an ostree commit \(only works for ostree targets\)
-	@echo \ \* .rootfs: Generate a directory with the rootfs content
 	@echo \ \* .tar: Generate a tar file with the rootfs content
-	@echo \ \* .ext4: Generate an ext4 filesystem with the rootfs content  \(size from \"image_size\"\)
 	@echo \ \* oci.tar: Generate an oci container image with the rootfs content
 	@echo
 	@echo You can pass variable declarations to osbuild-mpp with the DEFINES make variable.
@@ -76,9 +74,6 @@ help:
 	@echo For example, to add extra rpms to a minimal regular image, use:
 	@echo "  make cs9-qemu-minimal-regular.$(HOST_ARCH).qcow2 DEFINES='extra_rpms=[\"gdb\",\"strace\"]'"
 	@echo
-	@echo To easily run the image with qemu, you can use the included runvm tool, like:
-	@echo \ \ ./runvm cs9-qemu-minimal-regular.$(HOST_ARCH).qcow2
-	@echo
 	@echo There are some additional targets:
 	@echo  \ \ manifests: generates resolved json manifests for all images without building them.
 	@echo  \ \ clean_caches: Removes intermediate image build artifacts \(that improve rebuild speed\)
@@ -86,8 +81,6 @@ help:
 	@echo  \ \ clean: Run clean_caches and clean_downloads
 	@echo
 	@echo There are also some common conversion rules:
-	@echo  \ \ foo.ext4.simg will build foo.ext4 and then convert it with img2simg
-	@echo  \ \ foo.simg will build foo.img and then convert it with img2simg
 	@echo  \ \ foo.tar.gz will build $foo.tar and then gzip it
 	@echo
 	@echo "When building a custom variant of an image (say with an extra package) you can use a"
@@ -180,13 +173,5 @@ clean: clean_downloads clean_caches
 VM_SUDO=sudo
 VM_OSBUILD=sudo osbuild
 
-%.ext4.simg : %.ext4
-	img2simg $< $@
-	rm $<
-
-%.simg : %.img
-	img2simg $< $@
-	rm $<
-
 %.tar.gz : %.tar
 	gzip -f $<