Streamline ephemeral key handling:

- drop support for ephemeral RSA keys (only allowed/needed
  for export ciphers)

- drop pTmpKeys from the per-process SSLModConfigRec, and remove
  the temp key generation at startup (unnecessary for DHE/ECDHE)

- unconditionally disable null and export-grade ciphers by always
  prepending "!aNULL:!eNULL:!EXP:" to any cipher suite string

- do not configure per-connection SSL_tmp_*_callbacks, as it is
  sufficient to set them for the SSL_CTX

- set default curve for ECDHE at startup, obviating the need
  for a per-handshake callback, for the time being (and also
  configure SSL_OP_SINGLE_ECDH_USE, previously left out)

For additional background, see
https://mail-archives.apache.org/mod_mbox/httpd-dev/201309.mbox/%3C52358ED1.2070704@velox.ch%3E


Follow-up fixes for r1526168:

- drop SSL_TMP_KEY_* constants from ssl_private.h, too

- make sure we also disable aNULL, eNULL and EXP ciphers
  for per-direct...

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Add experimental cmake-based build system for Windows.

(Support for both trunk and 2.4.x has been removed for this first commit
to the 2.4.x branch.)

Thanks tdonovan for sharing your earlier version!  A lot
of good stuff is from Tom; a lot of bad stuff is from me.



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ready, but are being made ready. Basically, a holding
place for stuff that should be considered for backporting.



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is in the works


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Ensure that the file-based shm file is removed...
Reviewed/backported by: jim


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c->sbh can be unexpectedly NULL when the thread that pulls the ready keepalive
connection out of the queue laps the thread that put it on the queue.


Submitted by: covener
Reviewed/backported by: jim


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the remaining DefaultRuntimeDir functionality to the
2.4.x branch in a way that doesn't break existing
configs; the most recent info is on the dev list anyway


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socache provider arguments.


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No more magic numbers.
Reviewed/backported by: jim


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