CTestCustom: Ignore gcc optimizer warning in its own std lib

CTestCustom.cmake.in

diff --git a/CTestCustom.cmake.in b/CTestCustom.cmake.in
index 75642c9..591da55 100644
--- a/CTestCustom.cmake.in
+++ b/CTestCustom.cmake.in
@@ -51,6 +51,7 @@
   "Warning: Function .* can throw only the exceptions thrown by the function .* it overrides\\."
   "WarningMessagesDialog\\.cxx"
   "warning.*directory name.*CMake-Xcode.*/bin/.*does not exist.*"
+  "stl_algo(base)?\\.h:[0-9:]* warning: loop not unrolled"
   "stl_deque.h:1051"
   "Tests/CMakeLib/testCTestResourceSpec.cxx:.*warning: missing initializer for member.*cmCTestResourceSpec::.*" # GCC 4.8 disagrees with later compilers on C++11 initializer list conversion
   "(Lexer|Parser).*warning.*conversion.*may (alter its value|change the sign)"