Merge branch 'PHP-7.4'

* PHP-7.4:
  add librt for opcache

diff --cc ext/opcache/config.m4
index ef1e874b3eff7e9e8988170929f955d8cd9c1622,6c40cafc1c39203879e3f53ce84c2698158c7184..5e61575d480709d1ea0b3b3b8a1f08e864aa3b6e
--- 1/ext/opcache/config.m4
--- 2/ext/opcache/config.m4
+++ b/ext/opcache/config.m4
@@@ -321,9 -259,5 +327,10 @@@ int main() 
  
    PHP_ADD_BUILD_DIR([$ext_builddir/Optimizer], 1)
    PHP_ADD_EXTENSION_DEP(opcache, pcre)
 +
 +  if test "$PHP_OPCACHE_JIT" = "yes"; then
 +    PHP_ADD_BUILD_DIR([$ext_builddir/jit], 1)
 +    PHP_ADD_MAKEFILE_FRAGMENT($ext_srcdir/jit/Makefile.frag)
 +  fi
+   PHP_SUBST(OPCACHE_SHARED_LIBADD)
  fi