Add support for the LDLIBS flag

Author: NelsonVides

src/pc_port_env.erl

@@ -218,9 +218,9 @@ default_env() ->
      {"DRV_CC_TEMPLATE",
       "$CC -c $CFLAGS $DRV_CFLAGS $PORT_IN_FILES -o $PORT_OUT_FILE"},
      {"DRV_LINK_TEMPLATE",
-      "$CC $PORT_IN_FILES $LDFLAGS $DRV_LDFLAGS -o $PORT_OUT_FILE"},
+      "$CC $PORT_IN_FILES $LDFLAGS $LDLIBS $DRV_LDFLAGS -o $PORT_OUT_FILE"},
      {"DRV_LINK_CXX_TEMPLATE",
-      "$CXX $PORT_IN_FILES $LDFLAGS $DRV_LDFLAGS -o $PORT_OUT_FILE"},
+      "$CXX $PORT_IN_FILES $LDFLAGS $LDLIBS $DRV_LDFLAGS -o $PORT_OUT_FILE"},
      {"EXE_CXX_TEMPLATE",
       "$CXX -c $CXXFLAGS $EXE_CFLAGS $PORT_IN_FILES -o $PORT_OUT_FILE"},
      {"EXE_CC_TEMPLATE",