fix ctypes for Python 3.10 (RHBZ #1973621)

grass.spec

@@ -3,7 +3,7 @@
 
 Name:		grass
 Version:	7.8.5
-Release:	7%{?dist}
+Release:	8%{?dist}
 Summary:	GRASS GIS - Geographic Resources Analysis Support System
 
 %if 0%{?fedora} >= 33 || 0%{?rhel} >= 9
@@ -27,6 +27,7 @@ Source0:	https://grass.osgeo.org/%{name}%{shortver}/source/%{name}-%{version}.ta
 Patch1:		grass-7.8.0-buildroot.diff
 # Fix typename collision with custom "bool" type and bool from stdbool.h
 Patch2:		grass-bool.patch
+Patch3:		grass78_ctypes_py3_10.diff
 
 BuildRequires:	bison
 %if %{with flexiblas}
@@ -180,6 +181,7 @@ GRASS GIS development headers
 
 %patch1 -p1
 %patch2 -p1
+%patch3 -p1
 
 # Correct mysql_config query
 sed -i -e 's/--libmysqld-libs/--libs/g' configure
@@ -383,6 +385,9 @@ fi
 %{_libdir}/%{name}%{shortver}/include
 
 %changelog
+* Mon Jun 21 2021 Markus Neteler <neteler@mundialis.de> - 7.8.5-8
+- fix ctypes for Python 3.10 (RHBZ #1973621)
+
 * Fri May 07 2021 Sandro Mani <manisandro@gmail.com> - 7.8.5-7
 - Rebuild (gdal)
 

grass78_ctypes_py3_10.diff

@@ -0,0 +1,22 @@
+diff --git grass-7.8.5/lib/python/ctypes/ctypesgencore/parser/lex.py grass-7.8.5-new/lib/python/ctypes/ctypesgencore/parser/lex.py
+index 294d902d9..0d1447400 100644
+--- grass-7.8.5/lib/python/ctypes/ctypesgencore/parser/lex.py
++++ grass-7.8.5-new/lib/python/ctypes/ctypesgencore/parser/lex.py
+@@ -348,7 +348,7 @@ class Lexer:
+                     break
+ 
+                 # if func not callable, it means it's an ignored token
+-                if not isinstance(func, collections.Callable):
++                if not isinstance(func, collections.abc.Callable):
+                     break
+ 
+                 # If token is processed by a function, call it
+@@ -720,7 +720,7 @@ def lex(module=None, object=None, debug=0, optimize=0,
+         states, tokname = _statetoken(f, stateinfo)
+         toknames[f] = tokname
+ 
+-        if isinstance(t, collections.Callable):
++        if isinstance(t, collections.abc.Callable):
+             for s in states:
+                 funcsym[s].append((f, t))
+         elif (isinstance(t, bytes) or isinstance(t, str)):