Certain testing components require building with a specific subset of LDFLAGS,
such as `-O1`. This patch moves them to the default cmake invokation of `cmake .`
which is the equivalent of `cmake -D CMAKE_BUILD_TYPE:String=None .`
Also remove flags such as `-Werror` which are present in all configs.
Improve compilation flag granularity by disabling CMAKE_BUILD_TYPE defaults
and asserting test-specific flags manually.
Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
486b6c8252