python: Use range() instead of xrange()

Python 2 has a range() function which returns a list, and an xrange()
one which returns an iterator.

Python 3 lost the function returning a list, and renamed the function
returning an iterator as range().

As a result, using range() makes the scripts compatible with both Python
versions 2 and 3.

Signed-off-by: Mathieu Bridon <bochecha@daitauha.fr>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/mapi/glapi/gen/glX_proto_send.py

@@ -392,7 +392,7 @@ static const struct proc_pair
    _glapi_proc proc;
 } proc_pairs[%d] = {""" % len(procs))
         names = sorted(procs.keys())
-        for i in xrange(len(names)):
+        for i in range(len(names)):
             comma = ',' if i < len(names) - 1 else ''
             print('   { "%s", (_glapi_proc) gl%s }%s' % (names[i], procs[names[i]], comma))
         print("""};

src/mapi/glapi/gen/gl_gentable.py

@@ -216,13 +216,13 @@ class PrintCode(gl_XML.gl_print_base):
 
         # Check that the table has no gaps.  We expect a function at every offset,
         # and the code which generates the table relies on this.
-        for i in xrange(0, func_count):
+        for i in range(0, func_count):
             if funcnames[i] is None:
                 raise Exception("Function table has no function at offset %d" % (i))
 
         print("#define GLAPI_TABLE_COUNT %d" % func_count)
         print("static const char * const _glapi_table_func_names[GLAPI_TABLE_COUNT] = {")
-        for i in xrange(0, func_count):
+        for i in range(0, func_count):
             print("    /* %5d */ \"%s\"," % (i, funcnames[i]))
         print("};")
 

src/mapi/mapi_abi.py

@@ -260,7 +260,7 @@ def abi_sanity_check(entries):
     all_names = []
     last_slot = entries[-1].slot
     i = 0
-    for slot in xrange(last_slot + 1):
+    for slot in range(last_slot + 1):
         if entries[i].slot != slot:
             raise Exception('entries are not ordered by slots')
         if entries[i].alias: