rpm: skip qubes-mgmt-salt-dom0-update dependency in VM

Currently there is no way to run a Salt state system-wide from a VM,
so applying updates from qui-updates widget wont work. We need a
solution for that, but until then, exclude the dependency.

Keep the widget included anyway, as the update notification is still a
useful thing to have.

QubesOS/qubes-issues#4186

Makefile.builder

@@ -1,3 +1,5 @@
 RPM_SPEC_FILES := \
     rpm_spec/qubes-desktop-linux-manager.spec
 DEBIAN_BUILD_DIRS := debian
+RPM_BUILD_DEFINES.vm = --define "vm_package 1"
+RPM_BUILD_DEFINES += $(RPM_BUILD_DEFINES.$(PACKAGE_SET))

rpm_spec/qubes-desktop-linux-manager.spec.in

@@ -52,7 +52,10 @@ Requires:  libappindicator-gtk3
 Requires:  python%{python3_pkgversion}-systemd
 Requires:  gtk3
 Requires:  python%{python3_pkgversion}-qubesadmin >= 4.1.8
+%if !0%{?vm_package}
+# FIXME: we need some way for applying updates from GUI VM
 Requires:  qubes-mgmt-salt-dom0-update >= 4.0.5
+%endif
 Requires:  qubes-artwork >= 4.1.5
 
 Provides:   qui = %{version}-%{release}