[4315] Removed obsolete python3 check

configure.ac

@@ -1271,9 +1271,6 @@ AC_ARG_ENABLE(generate_docs, [AC_HELP_STRING([--enable-generate-docs],
   enable_generate_docs=$enableval, enable_generate_docs=no)
 
 if test "x$enable_generate_docs" != xno ; then
-  if test "$PYTHON" == "no" ; then
-    AC_MSG_ERROR("Python3 is required for enable-generate-docs")
-  fi
 
 # Check for xsltproc
   AC_PATH_PROG([XSLTPROC], [xsltproc])