Merge branch 'PHP-7.1' into PHP-7.2

* PHP-7.1:
  Fixed bug #75124 (gdImageGrayScale() may produce colors)

diff --cc NEWS
index c130d5bb03758b6c1844c440f5921154d73017b3,b70206849cfd92ab16ac4f78602037930ea0d5e1..51fa5e5d2ebe5a7cc2bff682f8f02c9342b890f2
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -7,10 -7,9 +7,11 @@@ PH
  
  - CURL:
    . Fixed bug #75093 (OpenSSL support not detected). (Remi)
 +  . Better fix for #74125 (use pkg-config instead of curl-config). (Remi)
  
  - GD:
 +  . Fixed bug #75111 (Memory disclosure or DoS via crafted .bmp image). (cmb)
+   . Fixed bug #75124 (gdImageGrayScale() may produce colors). (cmb)
  
  - Intl:
    . Fixed bug #75090 (IntlGregorianCalendar doesn't have constants from parent