Update dependencies

dbus-glib is deprecated, and nothing built in this package uses it;
the one sample app in contrib/ which does is not built or installed.
systemd-rpm-macros has been split out, which avoids installing the
entire systemd and its dependencies to build this.

gpsd.spec

@@ -16,7 +16,6 @@ Patch1:         gpsd-apistatus.patch
 
 BuildRequires:  gcc
 BuildRequires:  dbus-devel            
-BuildRequires:  dbus-glib-devel            
 BuildRequires:  ncurses-devel            
 BuildRequires:  python3-devel
 BuildRequires:  python3-setuptools
@@ -28,7 +27,7 @@ BuildRequires:  python3-pyserial
 BuildRequires:  desktop-file-utils
 BuildRequires:  bluez-libs-devel
 BuildRequires:  pps-tools-devel
-BuildRequires:  systemd
+BuildRequires:  systemd-rpm-macros
 %if %{with_qt}
 BuildRequires:  gcc-c++
 BuildRequires:  qt-devel