Do not create an index to the symbols with ar command

Author: ivankravets

builder/main.py

@@ -40,7 +40,7 @@ def _get_board_f_flash(env):
     RANLIB="xtensa-esp32-elf-ranlib",
     SIZETOOL="xtensa-esp32-elf-size",
 
-    ARFLAGS=["rcs"],
+    ARFLAGS=["rc"],
 
     ASFLAGS=["-x", "assembler-with-cpp"],