websocketapp: Fix multilib build

Fixes

ERROR: websocketpp-0.8.1-r0 do_package: QA Issue: websocketpp: Files/directories were installed but not shipped in any package:
/usr/lib
/usr/lib/cmake
/usr/lib/cmake/websocketpp
/usr/lib/cmake/websocketpp/websocketpp-configVersion.cmake
/usr/lib/cmake/websocketpp/websocketpp-config.cmake

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/websocketpp/websocketpp-0.8.1/0001-cmake-Use-GNUInstallDirs.patch

@@ -0,0 +1,35 @@
+From 771d79eeb0ac5079482a4b3a131bbda744793e7d Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Thu, 19 Dec 2019 20:07:11 -0800
+Subject: [PATCH] cmake: Use GNUInstallDirs
+
+Helps install cmakefiles in right libdir
+
+Upstream-Status: Submitted [https://github.com/zaphoyd/websocketpp/pull/854]
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ CMakeLists.txt | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 2786aba..080be3e 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -39,11 +39,13 @@ endif()
+ 
+ set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+ 
++include(GNUInstallDirs)
++
+ set(INSTALL_INCLUDE_DIR include CACHE PATH "Installation directory for header files")
+ if (WIN32 AND NOT CYGWIN)
+   set (DEF_INSTALL_CMAKE_DIR cmake)
+ else ()
+-  set (DEF_INSTALL_CMAKE_DIR lib/cmake/websocketpp)
++  set (DEF_INSTALL_CMAKE_DIR ${CMAKE_INSTALL_LIBDIR}/cmake/websocketpp)
+ endif ()
+ set (INSTALL_CMAKE_DIR ${DEF_INSTALL_CMAKE_DIR} CACHE PATH "Installation directory for CMake files")
+ 
+-- 
+2.24.1
+

meta-oe/recipes-support/websocketpp/websocketpp_0.8.1.bb

@@ -8,6 +8,7 @@ DEPENDS = "openssl boost zlib"
 SRC_URI = "git://github.com/zaphoyd/websocketpp.git;protocol=https \
            file://0001-Replace-make_shared-with-new-in-some-cases.patch \
            file://0002-Fix-missed-entries-fix-testing.patch \
+           file://0001-cmake-Use-GNUInstallDirs.patch \
           "
 
 # tag 0.8.1