`-g` makes binary smaller

[farcaller]

Building at 42676463b01af7fec2abdb354bf140247fc968f4 with -g:

Statistics for app_empty.elf
  .text: 696 bytes
  .data:  52 bytes
  .bss:    8 bytes
         =========
  TOTAL: 756 bytes (0x2f4)

without:

Statistics for app_empty.elf
  .text: 700 bytes
  .data:  52 bytes
  .bss:    8 bytes
         =========
  TOTAL: 760 bytes (0x2f8)