Guard against unintentional so-version bumps

https://docs.fedoraproject.org/en-US/packaging-guidelines/#_listing_shared_library_files

libgta.spec

@@ -1,6 +1,7 @@
 Name:      libgta
 Version:   1.2.1
-Release:   4%{?dist}
+%global so_version 1
+Release:   5%{?dist}
 Summary:   Library that implements the Generic Tagged Arrays file format
 License:   LGPLv2+
 URL:       https://marlam.de/gta/
@@ -57,7 +58,8 @@ rm -rf %{buildroot}%{_docdir}
 
 %files 
 %doc COPYING AUTHORS README
-%{_libdir}/%{name}.so.*
+%{_libdir}/%{name}.so.%{so_version}
+%{_libdir}/%{name}.so.%{so_version}.*
 
 %files devel
 %{_libdir}/cmake/GTA-%{version}
@@ -70,6 +72,9 @@ rm -rf %{buildroot}%{_docdir}
 
 
 %changelog
+* Wed May 26 2021 Benjamin A. Beasley <code@musicinmybrain.net> - 1.2.1-5
+- Guard against unintentional so-version bumps
+
 * Fri May 21 2021 Sandro Mani <manisandro@gmail.com> - 1.2.1-4
 - Rebuild (gdal)