gstlal-calibration.spec.in: point at right python-devel package for python3, organize Requires

gstlal-calibration/gstlal-calibration.spec.in

@@ -42,7 +42,13 @@ This package contains the plugins and shared libraries required to run the gstla
 %package devel
 Summary: Files and documentation needed for compiling gstlal-calibration based plugins and programs.
 Group: LSC Software/Data Analysis
-Requires: %{name} = %{version} gstlal-devel >= @MIN_GSTLAL_VERSION@ python-devel >= @MIN_PYTHON_VERSION@ %{gstreamername}-devel >= @MIN_GSTREAMER_VERSION@ %{gstreamername}-plugins-base-devel >= @MIN_GSTREAMER_VERSION@ lal-devel >= @MIN_LAL_VERSION@ lalmetaio-devel >= @MIN_LALMETAIO_VERSION@ gsl-devel
+Requires: gstlal-devel >= @MIN_GSTLAL_VERSION@
+Requires: python3-devel >= @MIN_PYTHON_VERSION@
+Requires: %{gstreamername}-devel >= @MIN_GSTREAMER_VERSION@
+Requires: %{gstreamername}-plugins-base-devel >= @MIN_GSTREAMER_VERSION@
+Requires: lal-devel >= @MIN_LAL_VERSION@
+Requires: lalmetaio-devel >= @MIN_LALMETAIO_VERSION@
+Requires: gsl-devel
 %description devel
 This package contains the files needed for building gstlal-calibration based
 plugins and programs.