Update spec to match Cython has update

sagemath.spec

@@ -162,29 +162,26 @@ Patch25:	%{name}-givaro.patch
 # No support for f" notation
 Patch26:	%{name}-nofstring.patch
 
-# https://bugzilla.redhat.com/show_bug.cgi?id=1296652
-Patch27:	sig_includes.patch
-
 # Add missing include paths
-Patch28:	%{name}-includes.patch
+Patch27:	%{name}-includes.patch
 
 # https://trac.sagemath.org/ticket/20926
 # #error This file requires compiler and library support for the ISO C++ \
 #	2011 standard. This support must be enabled with the -std=c++11 \
 #	or -std=gnu++11 compiler options.
-Patch29:	%{name}-gcc6.patch
+Patch28:	%{name}-gcc6.patch
 
 # Use ipython3 (mostly a rediff from sagemath-6.8 sage/repl)
-Patch30:	%{name}-ipython3.patch
+Patch29:	%{name}-ipython3.patch
 
 # Use atlas blas
-Patch31:	%{name}-atlas.patch
+Patch30:	%{name}-atlas.patch
 
 # Correct side effect of sagemath-ipython3 patch
-Patch32:	%{name}-is_in_terminal.patch
+Patch31:	%{name}-is_in_terminal.patch
 
 # Update for python-flask-0.11.1
-Patch33:	%{name}-flask.patch
+Patch32:	%{name}-flask.patch
 
 BuildRequires:	4ti2
 BuildRequires:	arb-devel
@@ -194,7 +191,7 @@ BuildRequires:	cddlib-tools
 BuildRequires:	cliquer-devel
 BuildRequires:	coin-or-Cbc-devel
 BuildRequires:	cryptominisat-devel
-BuildRequires:	Cython
+BuildRequires:	Cython >= 0.24.1
 BuildRequires:	desktop-file-utils
 BuildRequires:	dos2unix
 BuildRequires:	dvipng
@@ -692,13 +689,12 @@ popd
 %patch24
 %patch25
 %patch26
-
+%patch27
 %patch28
 %patch29
 %patch30
 %patch31
 %patch32
-%patch33
 
 sed -e 's|@@SAGE_ROOT@@|%{SAGE_ROOT}|' \
     -e 's|@@SAGE_DOC@@|%{SAGE_DOC}|' \
@@ -797,7 +793,6 @@ export PYTHONPATH=%{_builddir}%{python_sitearch}:$PYTHONPATH
     PATCH=$PWD/build/pkgs/cython/patches/pxi_sys_path.patch
     pushd %{_builddir}%{python_sitearch}
 	patch -p1 < $PATCH
-	patch -p1 < %{PATCH27}
     popd
 %endif