Remove crypt check for suitable Python

Remove crypt from the list of modules that we try to import when
checking whether a given system python will work for our purposes,
since:
- It doesn't work on Windows (so it prevents us from running sagemath on
  Windows)
- Searching the entire repo doesn't find any uses of crypt
- crypt is deprecated anyways (PEP 594 has its removal scheduled for
  Python 3.13)

The check for crypt was added at the same time as the other modules
being checked, but neither the commit message for
6fcd7cd nor the discussion in
Trac sagemath#27824 mentions why crypt specifically was added (Most of the
relevant discussion in that ticket is about the distutils check).

build/pkgs/python3/spkg-build.in

@@ -124,7 +124,7 @@ fi
 echo "Testing importing of various modules..."
 import_errors=false
 # Trac #31160: We no longer check for readline here.
-test_modules="ctypes math hashlib crypt socket zlib sqlite3 ssl"
+test_modules="ctypes math hashlib socket zlib sqlite3 ssl"
 if [ "$UNAME" = "Darwin" ]; then
     test_modules="$test_modules _scproxy"
 fi

build/pkgs/python3/spkg-configure.m4

@@ -24,7 +24,7 @@ SAGE_SPKG_CONFIGURE([python3], [
       dnl Check if we can do venv with a system python3
       dnl instead of building our own copy.
       dnl  Trac #31160: We no longer check for readline here.
-      check_modules="sqlite3, ctypes, math, hashlib, crypt, socket, zlib, distutils.core, ssl, ensurepip"
+      check_modules="sqlite3, ctypes, math, hashlib, socket, zlib, distutils.core, ssl, ensurepip"
       AC_CACHE_CHECK([for python3 >= ]MIN_VERSION[, < ]LT_VERSION[ with modules $check_modules], [ac_cv_path_PYTHON3], [
         AS_IF([test x"$ac_path_PYTHON3" != x], [dnl checking explicitly specified $with_python
            AC_MSG_RESULT([])