Log Message:
Update php-http to 1.7.3

Changes in 1.7.3
* Fixed Bug #61310: Bundled pecl_http-1.7.2.tgz is invalid

CHanges in 1.7.2
+ Added PHP-5.4 compatibility
* Fixed bug #59974 methodRegister doesn't allow "_" to be in method name
* Fixed SAPI hang if request body size is greater than 4k with
  http_get_request_body_stream()

Changes in 1.7.1
* Fixed a bug when the status component of the HTTP response is missing
  (fixes Bug #19390) (Ilia)
* Fixed double-free when auto-decompressing pages (Ilia)
* Fixed non-funtional HttpMessage::setResponseStatus()
* Fixed Bug #22177 (http_redirect breaks output with
  zlib.output_compression=on)
* Fixed Bug #17806 (Segmentation fault when passing invalid url
  to http_get())
* Fixed logic error and possible hang in sapi_deactivate when using
  http_get_request_body() with a request body longer than 4096 bytes (Rob)
* Fixed Bug #17896 (Make failed)