Fix accidental create of file '=2.1' when python build is included

configure.ac

@@ -601,7 +601,7 @@ AC_MSG_RESULT([$cf_with_python_binding])
 dnl AX_PYTHON_DEVEL from macros/ax_python_devel.m4
 AS_IF([test x"${cf_with_python_binding}" = "xyes"],[
     dnl Order matters!	AX_PYTHON_DEVEL must be first for PYTHON_VERSION to be honored.
-    AX_PYTHON_DEVEL([">='2.1'"])
+    AX_PYTHON_DEVEL([>='2.1'])
     AM_PATH_PYTHON([2.1],, [:])
 
     BINDING_LIST="${BINDING_LIST} python"