Move gmpxx.pc to -devel subpackage as well

This fixes fallout from previous commit that caused gmp-c++ to depend on
gmp-devel.

gmp.spec

@@ -6,7 +6,7 @@
 Summary: A GNU arbitrary precision library
 Name: gmp
 Version: 6.2.0
-Release: 4%{?dist}
+Release: 5%{?dist}
 Epoch: 1
 URL: http://gmplib.org/
 Source0: ftp://ftp.gmplib.org/pub/gmp-%{version}/gmp-%{version}.tar.bz2
@@ -162,12 +162,12 @@ export LD_LIBRARY_PATH=`pwd`/.libs
 
 %files c++
 %{_libdir}/libgmpxx.so.*
-%{_libdir}/pkgconfig/gmpxx.pc
 
 %files devel
 %{_libdir}/libgmp.so
 %{_libdir}/libgmpxx.so
 %{_libdir}/pkgconfig/gmp.pc
+%{_libdir}/pkgconfig/gmpxx.pc
 %{_includedir}/*.h
 %{_infodir}/gmp.info*
 
@@ -176,6 +176,9 @@ export LD_LIBRARY_PATH=`pwd`/.libs
 %{_libdir}/libgmpxx.a
 
 %changelog
+* Tue Sep 15 2020 Kalev Lember <klember@redhat.com> - 1:6.2.0-5
+- Move gmpxx.pc to -devel subpackage as well
+
 * Fri Aug 07 2020 Peter Robinson <pbrobinson@fedoraproject.org> - 1:6.2.0-4
 - The pkgcfg file should be in devel