cmake: ARM: clang: make warning non-fatal: inline asm

Clang issues a warning for some inline asm in stack_trace.cpp.  This
patch ieaves the warning to be displayed as a reminder to fix
the code.

CMakeLists.txt

@@ -323,6 +323,9 @@ else()
   endif()
   if(CMAKE_C_COMPILER_ID STREQUAL "Clang")
     set(WARNINGS "${WARNINGS} -Wno-error=mismatched-tags -Wno-error=null-conversion -Wno-overloaded-shift-op-parentheses -Wno-error=shift-count-overflow -Wno-error=tautological-constant-out-of-range-compare -Wno-error=unused-private-field -Wno-error=unneeded-internal-declaration")
+    if(ARM6 OR ARM7)
+      set(WARNINGS "${WARNINGS} -Wno-error=inline-asm")
+    endif()
   else()
     set(WARNINGS "${WARNINGS} -Wlogical-op -Wno-error=maybe-uninitialized")
   endif()