[cmake] fix boost comp options, add rapidjson endian, clang/amd64 error

Signed-off-by: crueter <crueter@crueter.xyz>

.patch/boost/0003-armasm-options.patch

@@ -0,0 +1,13 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 8210f65..108ac88 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -174,7 +174,7 @@ if(BOOST_CONTEXT_IMPLEMENTATION STREQUAL "fcontext")
+ 
+   set(IMPL_SOURCES ${ASM_SOURCES} src/fcontext.cpp)
+ 
+-  if(BOOST_CONTEXT_ASSEMBLER STREQUAL masm)
++  if(BOOST_CONTEXT_ASSEMBLER STREQUAL masm OR BOOST_CONTEXT_ASSEMBLER STREQUAL armasm)
+ 
+     set_property(SOURCE ${ASM_SOURCES} APPEND PROPERTY COMPILE_OPTIONS "/nologo")
+ 

CMakeLists.txt

@@ -91,6 +91,7 @@ if (MSVC AND CXX_CLANG)
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-sign-conversion>
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-reserved-identifier>
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-deprecated-declarations>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-cast-function-type-mismatch>
     )
 
     if (ARCHITECTURE_x86_64)
@@ -468,6 +469,10 @@ endif()
 
 # DiscordRPC
 if (USE_DISCORD_PRESENCE)
+    if (ARCHITECTURE_arm64)
+        add_compile_definitions(RAPIDJSON_ENDIAN=RAPIDJSON_LITTLEENDIAN)
+    endif()
+
     AddJsonPackage(discord-rpc)
 
     target_include_directories(discord-rpc INTERFACE ${discord-rpc_SOURCE_DIR}/include)