build: drop org.odbuild.mkdir patchfile

osbuild-133.rpm was released and includes required patch:
 - org.osbuild.mkdir: support creating dirs on mounts (osbuild/osbuild#1904)

Author: nikita-dubrovskii

build.sh

@@ -173,9 +173,7 @@ patch_osbuild() {
     mv /usr/bin/osbuild-mpp /usr/lib/osbuild/tools/
 
     # Now all the software is under the /usr/lib/osbuild dir and we can patch
-    cat /usr/lib/coreos-assembler/0001-hacks-for-coreos-selinux-issues.patch                      \
-        /usr/lib/coreos-assembler/0001-org.osbuild.mkdir-support-creating-dirs-on-mounts.patch    \
-        | patch -d /usr/lib/osbuild -p1
+    patch -d /usr/lib/osbuild -p1 < /usr/lib/coreos-assembler/0001-hacks-for-coreos-selinux-issues.patch
 
     # And then move the files back; supermin appliance creation will need it back
     # in the places delivered by the RPM.