graphics/rubygem-cairo: fix build with clang 16

Clang 16 has a new error about incompatible function types, which shows
up when building graphics/rubygem-cairo:

  rb_cairo_surface.c:2354:3: error: incompatible function pointer types passing 'VALUE (int, VALUE *, VALUE)' (aka 'unsigned long (int, unsigned long *, unsigned long)') to parameter of type 'VALUE (*)(VALUE, VALUE)' (aka 'unsigned long (*)(unsigned long, unsigned long)') [-Wincompatible-function-pointer-types]
    rb_define_method (rb_cCairo_GLSurface, "initialize",
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  /usr/local/include/ruby-3.1/ruby/internal/anyargs.h:287:135: note: expanded from macro 'rb_define_method'
  #define rb_define_method(klass, mid, func, arity)           RBIMPL_ANYARGS_DISPATCH_rb_define_method((arity), (func))((klass), (mid), (func), (arity))
                                                                                                                                        ^~~~~~
  /usr/local/include/ruby-3.1/ruby/internal/anyargs.h:276:1: note: passing argument to parameter here
  RBIMPL_ANYARGS_DECL(rb_define_method, VALUE, const char *)
  ^
  /usr/local/include/ruby-3.1/ruby/internal/anyargs.h:255:72: note: expanded from macro 'RBIMPL_ANYARGS_DECL'
  RBIMPL_ANYARGS_ATTRSET(sym) static void sym ## _01(__VA_ARGS__, VALUE(*)(VALUE, VALUE), int); \
                                                                         ^
  rb_cairo_surface.c:2368:3: error: incompatible function pointer types passing 'VALUE (int, VALUE *, VALUE)' (aka 'unsigned long (int, unsigned long *, unsigned long)') to parameter of type 'VALUE (*)(VALUE, VALUE)' (aka 'unsigned long (*)(unsigned long, unsigned long)') [-Wincompatible-function-pointer-types]
    rb_define_method (rb_cCairo_GLTextureSurface, "initialize",
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  /usr/local/include/ruby-3.1/ruby/internal/anyargs.h:287:135: note: expanded from macro 'rb_define_method'
  #define rb_define_method(klass, mid, func, arity)           RBIMPL_ANYARGS_DISPATCH_rb_define_method((arity), (func))((klass), (mid), (func), (arity))
                                                                                                                                        ^~~~~~
  /usr/local/include/ruby-3.1/ruby/internal/anyargs.h:276:1: note: passing argument to parameter here
  RBIMPL_ANYARGS_DECL(rb_define_method, VALUE, const char *)
  ^
  /usr/local/include/ruby-3.1/ruby/internal/anyargs.h:255:72: note: expanded from macro 'RBIMPL_ANYARGS_DECL'
  RBIMPL_ANYARGS_ATTRSET(sym) static void sym ## _01(__VA_ARGS__, VALUE(*)(VALUE, VALUE), int); \
                                                                         ^

This is because rb_define_method's last argument is the 'arity' of the
method, and in case of cr_gl_surface_initialize() and
cr_gl_texture_surface_initialize() it should be -1 to indicate a
variable number of arguments.

PR:		271706
Approved by:	portmgr (buildfix blanket)
MFH:		2023Q2

graphics/rubygem-cairo/Makefile

@@ -1,5 +1,6 @@
 PORTNAME=	cairo
 PORTVERSION=	1.17.8
+PORTREVISION=	1
 CATEGORIES=	graphics rubygems
 MASTER_SITES=	RG
 

graphics/rubygem-cairo/files/patch-ext_cairo_rb__cairo__surface.c

@@ -0,0 +1,20 @@
+--- ext/cairo/rb_cairo_surface.c.orig	2023-05-29 13:00:29 UTC
++++ ext/cairo/rb_cairo_surface.c
+@@ -2352,7 +2352,7 @@ Init_cairo_surface (void)
+     rb_define_class_under (rb_mCairo, "GLTextureSurface", rb_cCairo_GLSurface);
+ #ifdef RB_CAIRO_HAS_GL_SURFACE
+   rb_define_method (rb_cCairo_GLSurface, "initialize",
+-                    cr_gl_surface_initialize, 1);
++                    cr_gl_surface_initialize, -1);
+
+   rb_define_method (rb_cCairo_GLSurface, "set_size",
+                     cr_gl_surface_set_size, 2);
+@@ -2366,7 +2366,7 @@ Init_cairo_surface (void)
+   RB_CAIRO_DEF_SETTERS (rb_cCairo_GLSurface);
+
+   rb_define_method (rb_cCairo_GLTextureSurface, "initialize",
+-                    cr_gl_texture_surface_initialize, 1);
++                    cr_gl_texture_surface_initialize, -1);
+
+   RB_CAIRO_DEF_SETTERS (rb_cCairo_GLTextureSurface);
+ #endif