cmake: Make it possible to load cmake files from develop/lib instead of just lib.

This works, but it is not so useful yet, because CMake tries to look
for binaries in "../bin" relative to the lib dir, so any CMake script
that imports targets without specifying their exact path (as LLVM does)
will not work yet.

dev-util/cmake/cmake-3.16.0.recipe

@@ -7,7 +7,7 @@ of your choice."
 HOMEPAGE="https://cmake.org/"
 COPYRIGHT="2002-2019 Kitware, Inc., Insight Consortium"
 LICENSE="CMake"
-REVISION="1"
+REVISION="2"
 SOURCE_URI="https://cmake.org/files/v3.16/cmake-$portVersion.tar.gz"
 CHECKSUM_SHA256="6da56556c63cab6e9a3e1656e8763ed4a841ac9859fefb63cbe79472e67e8c5f"
 SOURCE_DIR="cmake-$portVersion"

dev-util/cmake/patches/cmake-3.16.0.patchset

@@ -157,3 +157,29 @@ index 7e0af61..4129c00 100644
 -- 
 2.24.0
 
+
+From eb38d3c7ff8edae11ba59ecfd3dcbe98b8a403d3 Mon Sep 17 00:00:00 2001
+From: Augustin Cavalier <waddlesplash@gmail.com>
+Date: Fri, 21 Feb 2020 15:38:39 -0500
+Subject: [PATCH] Modules/Haiku: Set CMAKE_SYSTEM_FRAMEWORK_PATH.
+
+---
+ Modules/Platform/Haiku.cmake | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/Modules/Platform/Haiku.cmake b/Modules/Platform/Haiku.cmake
+index 4129c00..9523a92 100644
+--- a/Modules/Platform/Haiku.cmake
++++ b/Modules/Platform/Haiku.cmake
+@@ -129,6 +129,9 @@ LIST(APPEND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES
+ 
+ LIST(APPEND CMAKE_SYSTEM_LIBRARY_PATH ${CMAKE_HAIKU_DEVELOP_LIB_DIRECTORIES})
+ 
++# This is needed for find_package to search develop/lib/cmake/.
++list(APPEND CMAKE_SYSTEM_FRAMEWORK_PATH /boot/system/develop /boot/system/non-packaged/develop)
++
+ if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+   set(CMAKE_INSTALL_PREFIX "/boot/system" CACHE PATH
+     "Install path prefix, prepended onto install directories." FORCE)
+-- 
+2.24.1