debian: Disable fwupd support

We don't support it in the Librem 5 so there is no point installing it,
and by extension supporting it in GNOME Software.

debian/rules

@@ -7,6 +7,7 @@ export DEB_LDFLAGS_MAINT_APPEND = -Wl,-O1 -Wl,--as-needed
 export DEB_LDFLAGS_MAINT_STRIP := -Wl,-Bsymbolic-functions
 
 GS_CONFIGURE_FLAGS = \
+	-Dfwupd=false \
 	-Dgnome_desktop=true \
 	-Dmalcontent=false \
 	-Dodrs=true \
@@ -18,7 +19,6 @@ GS_CONFIGURE_FLAGS = \
 
 # these are conditionally re-enabled later
 GS_CONFIGURE_FLAGS += \
-	-Dfwupd=false \
 	-Dflatpak=false \
 	-Dgudev=false \
 	-Dvalgrind=false
@@ -31,9 +31,6 @@ ifeq ($(DEB_HOST_ARCH_OS), linux)
 
 	# Enable GUdev support on Linux
 	GS_CONFIGURE_FLAGS += -Dgudev=true
-	
-	# Enable fwupd support on Linux
-	GS_CONFIGURE_FLAGS += -Dfwupd=true
 
 	# Enable valgrind support on supported architectures
 	ifneq (,$(filter $(DEB_HOST_ARCH), amd64 arm64 armhf i386 mips mips64 mips64el mipsel powerpc ppc64el s390x))