Remove dead CMake code (#1230)

Remove CMake statements that have no effect in math_brute_force.

set_source_files_properties without a list of files has no effect.

When MODULE_NAME is FOO,
set_source_files_properties(${MODULE_NAME}_SOURCES ...) sets the
properties of "FOO_SOURCES", not of the files listed in the variable
named FOO_SOURCES.

Signed-off-by: Marco Antognini <marco.antognini@arm.com>
1 file changed