CTestCustom: Suppress scan-build warnings in libuv

Clang scan-build warns in some expansions of RB_GENERATE_STATIC
that it has a "Dereference of null pointer".  It also warns that
"The left operand of '==' is a garbage value" strangely.  Simply
suppress these since this is third-party code anyway.

CTestCustom.cmake.in

@@ -62,6 +62,7 @@ list(APPEND CTEST_CUSTOM_WARNING_EXCEPTION
   "warning.*This version of Mac OS X is unsupported"
   "clang.*: warning: argument unused during compilation: .-g"
   "note: in expansion of macro" # diagnostic context note
+  "note: expanded from macro" # diagnostic context note
   "cm(StringCommand|CTestTestHandler)\\.cxx.*warning.*rand.*may return deterministic values"
   "cm(StringCommand|CTestTestHandler)\\.cxx.*warning.*rand.*isn.*t random" # we do not do crypto
   "cm(StringCommand|CTestTestHandler)\\.cxx.*warning.*srand.*seed choices are.*poor" # we do not do crypto
@@ -82,6 +83,8 @@ list(APPEND CTEST_CUSTOM_WARNING_EXCEPTION
   "cm_sha2.*warning: Value stored to.*is never read"
   "testProcess.*warning: Dereference of null pointer .loaded from variable .invalidAddress.."
   "liblzma/simple/x86.c:[0-9]+:[0-9]+: warning: The result of the '<<' expression is undefined"
+  "libuv/src/.*:[0-9]+:[0-9]+: warning: Dereference of null pointer"
+  "libuv/src/.*:[0-9]+:[0-9]+: warning: The left operand of '==' is a garbage value"
   )
 
 if(NOT "@CMAKE_GENERATOR@" MATCHES "Xcode")