libwabt: opt out for xplat release builds

CMakeLists.txt

@@ -155,7 +155,9 @@ if(CC_TARGETS_AMD64)
     add_definitions(-D_M_X64_OR_ARM64)
     add_compile_options(-msse4.2)
 
-    set(CAN_BUILD_WABT 1)
+    if(NOT CMAKE_BUILD_TYPE STREQUAL Release)
+        set(CAN_BUILD_WABT 1)
+    endif()
 elseif(CC_TARGETS_X86)
     add_definitions(-D__i686__)
     add_definitions(-D_M_IX86_OR_ARM32)