Merge issue #15298: ensure _sysconfigdata is generated in build directory,

not source directory.

Patch by: Richard Oudkerk (sbt).

diff --cc Lib/sysconfig.py
Simple merge

diff --cc Misc/NEWS
index 7ca2d50f2dbf539b82f5e4216f5df8189de855d5,f779e02e00a2d884d087420c500ce74b5c471106..5d17aec0def37d248f063646d02837c7a42bc0bc
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -165,10 -137,8 +168,10 @@@ Buil
  - Issue #15923: Fix a mistake in ``asdl_c.py`` that resulted in a TypeError
    after 2801bf875a24 (see #15801).
  
- - Issue #15819: Make sure we can build Python out-of-tree from a readonly source
-   directory.  (Somewhat related to Issue #9860.)
 +- Issue #16135: Remove OS/2 support.
 +
+ - Issue #15819: Make sure we can build Python out-of-tree from a read-only
+   source directory.  (Somewhat related to issue #9860.)
  
  Documentation
  -------------

diff --cc setup.py
Simple merge