Rebuild for mpfr 4. Drop -mpfr patch.

sagemath.spec

@@ -95,7 +95,7 @@
 Name:		sagemath
 Summary:	A free open-source mathematics software system
 Version:	8.8
-Release:	6%{?dist}
+Release:	7%{?dist}
 # The file ${SAGE_ROOT}/COPYING.txt is the upstream license breakdown file
 # Additionally, every $files section has a comment with the license name
 # before files with that license
@@ -178,9 +178,6 @@ Patch19:	%{name}-fes.patch
 # https://bugzilla.redhat.com/show_bug.cgi?id=974769
 Patch20:	%{name}-sympy.patch
 
-# Adapt to MPFR 3.x.  Remove this once Fedora updates to MPFR 4.x.
-Patch21:	%{name}-mpfr.patch
-
 # Correct unable to start QEPCAD within sage
 # https://bugzilla.redhat.com/show_bug.cgi?id=1243590
 Patch22:	%{name}-qepcad.patch
@@ -911,7 +908,6 @@ popd
 %endif
 
 %patch20
-%patch21
 %patch22
 %patch23
 %patch24
@@ -1933,6 +1929,10 @@ rm -fr %{SAGE_LOCAL}/var/lib/sage/installed/database_cremona_ellcurve-%{cremona_
 
 ########################################################################
 %changelog
+* Fri Oct 11 2019 Jerry James <loganjerry@gmail.com> - 8.8-7
+- Rebuild for mpfr 4
+- Drop -mpfr patch
+
 * Thu Sep 26 2019 Jerry James <loganjerry@gmail.com> - 8.8-6
 - Rebuild for ntl 11.4.0
 - Add primecount support, including the -primecount patch