tools/sdk: remove conflicting time.o from libmain.a

tools/sdk/lib/README.md

@@ -3,22 +3,25 @@
 After updating SDK libraries to a new version, do the following changes.
 
 
-1. Remove mem_manager.o from libmain.a to use custom heap implementation
+Remove mem_manager.o from libmain.a to use custom heap implementation, and time.o to fix redefinition of time-related functions:
 
-    ```bash
-    xtensa-lx106-elf-ar -d libmain.a mem_manager.o
-    ```
+```bash
+xtensa-lx106-elf-ar -d libmain.a mem_manager.o
+xtensa-lx106-elf-ar -d libmain.a time.o
+```
 
 ## Updating libstdc++
 
 After building gcc using crosstool-NG, get compiled libstdc++ and remove some objects:
 
-    xtensa-lx106-elf-ar d libstdc++.a pure.o
-    xtensa-lx106-elf-ar d libstdc++.a vterminate.o
-    xtensa-lx106-elf-ar d libstdc++.a guard.o
-    xtensa-lx106-elf-ar d libstdc++.a functexcept.o
-    xtensa-lx106-elf-ar d libstdc++.a del_op.o
-    xtensa-lx106-elf-ar d libstdc++.a del_opv.o
-    xtensa-lx106-elf-ar d libstdc++.a new_op.o
-    xtensa-lx106-elf-ar d libstdc++.a new_opv.o
+```bash
+xtensa-lx106-elf-ar d libstdc++.a pure.o
+xtensa-lx106-elf-ar d libstdc++.a vterminate.o
+xtensa-lx106-elf-ar d libstdc++.a guard.o
+xtensa-lx106-elf-ar d libstdc++.a functexcept.o
+xtensa-lx106-elf-ar d libstdc++.a del_op.o
+xtensa-lx106-elf-ar d libstdc++.a del_opv.o
+xtensa-lx106-elf-ar d libstdc++.a new_op.o
+xtensa-lx106-elf-ar d libstdc++.a new_opv.o
+```