lerc: fix build (probably with older compilers)

Author: adam

graphics/lerc/distinfo

@@ -1,5 +1,6 @@
-$NetBSD: distinfo,v 1.1 2025/08/17 09:37:52 bsiegert Exp $
+$NetBSD: distinfo,v 1.2 2026/01/28 13:37:48 adam Exp $
 
 BLAKE2s (lerc-4.0.0.tar.gz) = 877998e672801d4da465c6d4e137d9efd2863ff10558cccb76f2786005343581
 SHA512 (lerc-4.0.0.tar.gz) = 36fe453b6e732f6bed554d1c1c5cd4668aec63593d6de11f12b659c7b9cbc059ac9aaacc6cea483b3257d522f1b07e13c299914d08b1f8aeb0bb2cde42ba47cf
 Size (lerc-4.0.0.tar.gz) = 4710408 bytes
+SHA1 (patch-src_LercLib_Lerc.cpp) = c3d0479fa9f449aa0f6db39b15ff01b701c6446c

graphics/lerc/patches/patch-src_LercLib_Lerc.cpp

@@ -0,0 +1,14 @@
+$NetBSD: patch-src_LercLib_Lerc.cpp,v 1.1 2026/01/28 13:37:48 adam Exp $
+
+https://github.com/Esri/lerc/issues/228
+
+--- src/LercLib/Lerc.cpp.orig	2026-01-28 13:35:44.015198473 +0000
++++ src/LercLib/Lerc.cpp
+@@ -26,6 +26,7 @@ Contributors:  Thomas Maurer
+ #include "Lerc2.h"
+ #include <typeinfo>
+ #include <limits>
++#include <functional>
+ 
+ #ifdef HAVE_LERC1_DECODE
+   #include "Lerc1Decode/CntZImage.h"