PHP 7.1 INTERNALS UPGRADE NOTES

1. Internal API changes
  a.

2. Build system changes
  a. Unix build system changes
  b. Windows build system changes

3. Module changes

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1. Internal API changes
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  a.

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2. Build system changes
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  a. Unix build system changes

  b. Windows build system changes

    .  Minimum supported Windows versions are Windows 7/Server 2008 R2.
    .  nice() now have a Windows alternative that is implemented in win32/nice.c, using
	   SetPriorityClass(). See the implementation for more in-depth details. This also 
	   defines HAVE_NICE.

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3. Module changes
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- Session:
  . php_session_start()/session_reset_id() return value is changed from void to int.
    It returns SUCCESS/FAILURE.
  . Session module manages session status correctly.