Added gcov flag to generate relative path for .gcda files

coverage/coverage.cmake

@@ -8,5 +8,5 @@ if(${YOTTA_CFG_DEBUG_OPTIONS_COVERAGE_MODULES_${under_name}})
     if(${s})
         get_target_property(flags ${YOTTA_MODULE_NAME} COMPILE_FLAGS)
     endif()
-    set_target_properties(${YOTTA_MODULE_NAME} PROPERTIES COMPILE_FLAGS "${flags} -fprofile-arcs -ftest-coverage")
+    set_target_properties(${YOTTA_MODULE_NAME} PROPERTIES COMPILE_FLAGS "${flags} -fprofile-arcs -ftest-coverage -fprofile-dir=.")
 endif()