[COPR] Restore dist in Release

This is to fix:
WARNING: No disttag found in prebuilt packages
INFO: Use --define DISTTAG to set proper dist. e. g. --define DISTTAG fc21.
ERROR: 'No disttag in package and no DISTTAG flag. Use --define DISTTAG to set proper dist e. g., --define DISTTAG=fc21.' (logs in /var/lib/copr-rpmbuild/workspace/workdir-wgba9jrq/.cache/fedora-review.log)

Also adding option to git_commint_no suppressing new line prevents
breaking line in Release tag.

Signed-off-by: Przemo Firszt <przemo@firszt.eu>

package/fedora/freecad.spec

@@ -32,7 +32,7 @@
 Name:           %{name}
 Epoch:          1
 Version:    	0.19
-Release:        pre_{{{ git_commit_no }}}
+Release:        pre_{{{git_commit_no}}}%{?dist}
 Summary:        A general purpose 3D CAD modeler
 Group:          Applications/Engineering
 

package/fedora/rpkg.macros

@@ -1,4 +1,4 @@
 function git_commit_no {
 	commits=$(curl -s 'https://api.github.com/repos/FreeCAD/FreeCAD/compare/120ca87015...master' | grep "ahead_by" | sed -s 's/ //g' | sed -s 's/"ahead_by"://' | sed -s 's/,//')
-	echo $((commits + 1))
+	echo -n $((commits + 1))
 }