xorg-libXt: improve vendor handling

x11/xorg-libXt/Portfile

@@ -4,7 +4,7 @@ PortSystem      1.0
 
 name            xorg-libXt
 version         1.3.0
-revision        0
+revision        1
 
 checksums       rmd160  419bd67ac7b1370267f52d2576e461aee56255e9 \
                 sha256  52820b3cdb827d08dc90bdfd1b0022a3ad8919b57a39808b12591973b331bf91 \
@@ -26,6 +26,8 @@ distname        libXt-${version}
 
 use_xz          yes
 
+patchfiles      patch-src-vendor.diff
+
 # this port repeatedly fails to build parallel on Tiger
 platform darwin 8 {
     use_parallel_build   no

x11/xorg-libXt/files/patch-src-vendor.diff

@@ -0,0 +1,24 @@
+This allows Motif and Athena to override the symbols even when linking for
+two-level namespace.
+--- src/Vendor.c.orig	2023-04-10 00:48:48
++++ src/Vendor.c	2024-05-22 23:24:02
+@@ -82,6 +82,9 @@
+ #endif
+
+ /* *INDENT-OFF* */
++#if defined(__APPLE__)
++__attribute__((weak))
++#endif
+ externaldef(vendorshellclassrec)
+ VendorShellClassRec vendorShellClassRec = {
+     {
+@@ -138,6 +141,9 @@
+ /* *INDENT-ON* */
+
+ #if !defined(AIXSHLIB) || !defined(SHAREDCODE)
++#if defined(__APPLE__)
++__attribute__((weak))
++#endif
+ externaldef(vendorshellwidgetclass)
+ WidgetClass vendorShellWidgetClass = (WidgetClass) (&vendorShellClassRec);
+ #endif