Revert "[compilation] PS-8185 - Fix compilation of ROUTER on clang 7"

This reverts commit 2ffd182.

router/CMakeLists.txt

@@ -21,19 +21,6 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
-# Fix "undefined reference to '__muloti4'" for clang-7 or older
-# https://stackoverflow.com/questions/49793632/clang-fsanitize-undefined-with-128-integer-operations-undefined-reference-to
-IF(CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8)
-  STRING_APPEND(CMAKE_CXX_LINK_FLAGS " --rtlib=compiler-rt -lgcc_s")
-ENDIF()
-
-# Disable ld.gold for clang-7 and clang-8
-IF(USE_LD_LLD AND CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND
-   NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.0 AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
-  STRING(REPLACE "-fuse-ld=gold" "" CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS}")
-  STRING(REPLACE "-fuse-ld=gold" "" CMAKE_CXX_LINK_FLAGS "${CMAKE_CXX_LINK_FLAGS}")
-ENDIF()
-
 INCLUDE(cmake/version.cmake)
 SET(CMAKE_MODULE_PATH
   ${CMAKE_MODULE_PATH}