Update to 2.20

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1810349

Avoid calling `rpm` to get ply version info:

  https://pagure.io/packaging-committee/pull-request/954

Drop no longer needed dos2unix.
Switch to %autosetup.
Switch to %python3.

python-pycparser.spec

@@ -1,27 +1,25 @@
-# Ensure that pycparser uses the same YACC __tabversion__ as python-ply
-# package to prevent "yacc table file version is out of date" problem.
-%define ply_version %(LC_ALL=C rpm -q --qf '%%{VERSION}' python3-ply | grep -Eo '^[^.]+\.[^.]+')
-
 %bcond_without tests
 
 Name:           python-pycparser
 Summary:        C parser and AST generator written in Python
-Version:        2.19
-Release:        3%{?dist}
+Version:        2.20
+Release:        1%{?dist}
 License:        BSD
 URL:            http://github.com/eliben/pycparser
-Source0:        http://github.com/eliben/pycparser/archive/release_v%{version}.tar.gz
+Source0:        %{url}/archive/release_v%{version}.tar.gz
 Source1:        pycparser-0.91.1-remove-relative-sys-path.py
 
-Patch100:       pycparser-2.10-ply.patch
 # This is Fedora-specific; I don't think we should request upstream to
 # remove embedded libraries from their distribuution, when we can remove
 # them during packaging.
+# It also ensures that pycparser uses the same YACC __tabversion__ as ply
+# package to prevent "yacc table file version is out of date" problem.
+Patch100:       pycparser-unbundle-ply.patch
 
 BuildArch:      noarch
 
-BuildRequires:  python3-devel python3-setuptools
-BuildRequires:  dos2unix
+BuildRequires:  python3-devel
+BuildRequires:  python3-setuptools
 BuildRequires:  python3-ply
 
 # for unit tests
@@ -35,8 +33,7 @@ It is a module designed to be easily integrated into applications that
 need to parse C source code.
 
 %package -n python3-pycparser
-Summary:        C parser and AST generator written in Python
-Requires:       python3-ply = %{ply_version}
+Summary:        %{summary}
 %{?python_provide:%python_provide python3-pycparser}
 
 %description -n python3-pycparser
@@ -45,20 +42,18 @@ It is a module designed to be easily integrated into applications that
 need to parse C source code.
 
 %prep
-%setup -q -n pycparser-release_v%{version}
-%patch100 -p1 -F5 -b .ply
+%autosetup -p1 -n pycparser-release_v%{version}
 
 # remove embedded copy of ply
-rm -rf pycparser/ply
+rm -r pycparser/ply
 
-# examples
-%{__python3} %{SOURCE1} examples
-dos2unix LICENSE
+# Remove relative sys.path from the examples
+%{python3} %{SOURCE1} examples
 
 %build
 %py3_build
 pushd build/lib/pycparser
-%{__python3} _build_tables.py
+%{python3} _build_tables.py
 popd
 
 %install
@@ -66,7 +61,7 @@ popd
 
 %check
 %if %{with tests}
-%{__python3} tests/all_tests.py 
+%{python3} tests/all_tests.py
 %endif
  
 %files -n python3-pycparser
@@ -76,6 +71,9 @@ popd
 %{python3_sitelib}/pycparser-*.egg-info/
 
 %changelog
+* Fri Jun 05 2020 Miro Hrončok <mhroncok@redhat.com> - 2.20-1
+- Update to 2.20 (#1810349)
+
 * Sat May 23 2020 Miro Hrončok <mhroncok@redhat.com> - 2.19-3
 - Rebuilt for Python 3.9