Add BTI enablement in TS

Add BTI_ENABLED option which enables bti in the sp,
opteesp and arm-linux environments.

Signed-off-by: Gabor Toth <gabor.toth2@arm.com>
Change-Id: I2ed477f52000839c61d4f0631c5fd19465c5b7a3
diff --git a/external/CppUTest/cpputest-init-cache.cmake.in b/external/CppUTest/cpputest-init-cache.cmake.in
index b24f5de..d73b6ec 100644
--- a/external/CppUTest/cpputest-init-cache.cmake.in
+++ b/external/CppUTest/cpputest-init-cache.cmake.in
@@ -10,6 +10,7 @@
 set(MEMORY_LEAK_DETECTION OFF CACHE BOOL "")
 set(LONGLONG ON CACHE BOOL "")
 set(C++11 ON CACHE BOOL "")
+set(BTI_ENABLED @BTI_ENABLED@ CACHE BOOL "")
 
 string(TOUPPER @CMAKE_CROSSCOMPILING@ CMAKE_CROSSCOMPILING) # CMake expects TRUE
 if (CMAKE_CROSSCOMPILING)