Fix str.count naming

Author: msimacek

graalpython/com.oracle.graal.python.test/src/tests/unittest_tags/test_unicode.txt

@@ -28,6 +28,7 @@
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_expandtabs_optimization
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_expandtabs_overflows_gracefully
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_extended_getslice
+*graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_find_etc_raise_correct_error_messages
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_fixtype
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_floatformatting
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_format_auto_numbering

graalpython/lib-graalpython/str.py

@@ -336,7 +336,7 @@ def strformat(___self, *___args, **___kwargs):
 str.format = strformat
 
 
-def strcount(self, sub, start=None, end=None):
+def count(self, sub, start=None, end=None):
     selfLeng = len(self)
     subLeng = len(sub)
     if start == None:
@@ -365,7 +365,7 @@ def strcount(self, sub, start=None, end=None):
     return cnt
 
 
-str.count = strcount
+str.count = count
 
 
 def encode(self, encoding="utf-8", errors="strict"):