(re)added the 'modelsim_search_libraries' key because modelsim crashed

without it

boards/uniboard1/designs/unb1_test/revisions/unb1_test_10GbE/hdllib.cfg

@@ -52,3 +52,7 @@ modelsim_compile_ip_files =
     $RADIOHDL/libraries/technology/ip_stratixiv/ddr3_uphy_4g_800_master/copy_hex_files.tcl
 
 
+modelsim_search_libraries =
+# stratixiv only
+    altera_ver lpm_ver sgate_ver altera_mf_ver altera_lnsim_ver stratixiv_ver stratixiv_hssi_ver stratixiv_pcie_hip_ver
+    altera     lpm     sgate     altera_mf     altera_lnsim     stratixiv     stratixiv_hssi     stratixiv_pcie_hip