Include standalone /usr/bin/js52 interpreter

Polari and gnome-shell are going to make use of it to syntax check js
files in CI. This puts it in the -devel subpackage, in line with how
Debian is packaging /usr/bin/js52 in their -dev subpackage.

mozjs52.spec

@@ -7,7 +7,7 @@
 
 Name:           mozjs%{major}
 Version:        52.4.0
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        SpiderMonkey JavaScript library
 
 License:        MPLv2.0 and MPLv1.1 and BSD and GPLv2+ and GPLv3+ and LGPLv2.1 and LGPLv2.1+ and AFL and ASL 2.0
@@ -123,8 +123,8 @@ popd
 # Fix permissions
 chmod -x %{buildroot}%{_libdir}/pkgconfig/*.pc
 
-# We only need the shared library
-rm %{buildroot}%{_bindir}/js*
+# Remove unneeded files
+rm %{buildroot}%{_bindir}/js52-config
 rm %{buildroot}%{_libdir}/libjs_static.ajs
 
 # Rename library and create symlinks, following fix-soname.patch
@@ -156,11 +156,15 @@ jit-test/jit_test.py -s -t 1800 --no-progress ../../js/src/js/src/shell/js basic
 %{_libdir}/libmozjs-%{major}.so.0*
 
 %files devel
+%{_bindir}/js52
 %{_libdir}/libmozjs-%{major}.so
 %{_libdir}/pkgconfig/*.pc
 %{_includedir}/mozjs-%{major}/
 
 %changelog
+* Tue Oct 31 2017 Kalev Lember <klember@redhat.com> - 52.4.0-3
+- Include standalone /usr/bin/js52 interpreter
+
 * Tue Oct 31 2017 Kalev Lember <klember@redhat.com> - 52.4.0-2
 - Various secondary arch fixes