python3: update to version 3.6.9

3.6.9 is the latest security fix release of Python 3.6.

- Fixes: CVE-2018-20852, CVE-2019-9948, CVE-2019-9740, CVE-2019-5010
- Refreshed patches
- Removed a few backports patches

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>

lang/python/python3/patches/014-remove-platform-so-suffix.patch

@@ -1,6 +1,6 @@
 --- a/configure
 +++ b/configure
-@@ -14995,7 +14995,7 @@ $as_echo_n "checking ABIFLAGS... " >&6;
+@@ -15171,7 +15171,7 @@ $as_echo_n "checking ABIFLAGS... " >&6;
  $as_echo "$ABIFLAGS" >&6; }
  { $as_echo "$as_me:${as_lineno-$LINENO}: checking SOABI" >&5
  $as_echo_n "checking SOABI... " >&6; }
@@ -11,7 +11,7 @@
  
 --- a/configure.ac
 +++ b/configure.ac
-@@ -4647,7 +4647,7 @@ AC_SUBST(SOABI)
+@@ -4753,7 +4753,7 @@ AC_SUBST(SOABI)
  AC_MSG_CHECKING(ABIFLAGS)
  AC_MSG_RESULT($ABIFLAGS)
  AC_MSG_CHECKING(SOABI)