remove error_buffer_copy (#163)

We had a stray declaration of vips_error_buffer_copy() in FFI.php. This
would prevent php-vips starting with libvips before 8.9.

Thanks Waschnick.

see #162

Author: jcupitt

CHANGELOG.md

@@ -4,6 +4,8 @@ All notable changes to `:vips` will be documented in this file.
 
 ## master
 
+- remove unused vips_error_buffer_copy() declaration to fix compatibility with
+  libvips before 8.9 [Waschnick]
 - refactor callBase() for maintainability
 - work around a php-ffi memory leak in getPspec() [levmv]
 - work around a php-ffi memory leak in arrayType()

README.md

@@ -48,7 +48,7 @@ to your `composer.json`:
 
 php-vips does not yet support preloading, so you need to enable FFI globally.
 This has some security implications, since anyone who can run php on your
-server can use it to make calls off into any native library they can find.
+server can use it to call any native library they have access to.
 
 Of course if attackers are running their own PHP code on your webserver you
 are probably already toast, unfortunately.

src/FFI.php

@@ -443,7 +443,6 @@ private static function init(): void
 int vips_shutdown (void);
 
 const char *vips_error_buffer (void);
-char *vips_error_buffer_copy (void);
 void vips_error_clear (void);
 void vips_error_freeze (void);
 void vips_error_thaw (void);