Reverse of https://github.com/rizsotto/Bear/commit/83383261e0756d2a5c5b85cf469f1fa34110c9ed
https://github.com/rizsotto/Bear/issues/625

--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -83,8 +83,6 @@ ExternalProject_Add(BearSource
             -DCMAKE_MODULE_LINKER_FLAGS:STRING=${CMAKE_MODULE_LINKER_FLAGS}
             -DROOT_INSTALL_PREFIX:PATH=${CMAKE_INSTALL_PREFIX}
             ${CMAKE_CACHE_ARGS_EXTRA}
-        BUILD_ALWAYS
-            1
         TEST_BEFORE_INSTALL
             1
         TEST_COMMAND