mbedtls: fix test binaries not being stripped · phoenix-rtos/phoenix-rtos-ports@043f335

Build: phoenix-rtos-lwip/lib-lwip/src/core/netif.c#L317

array subscript has type 'char' [-Wchar-subscripts]

Build: phoenix-rtos-lwip/lib-lwip/src/core/netif.c#L317

array subscript has type 'char' [-Wchar-subscripts]

Build: phoenix-rtos-lwip/lib-lwip/src/core/netif.c#L317

array subscript has type 'char' [-Wchar-subscripts]

Build: phoenix-rtos-lwip/lib-lwip/src/core/netif.c#L317

array subscript has type 'char' [-Wchar-subscripts]

Build: phoenix-rtos-lwip/lib-lwip/src/core/netif.c#L317

array subscript has type 'char' [-Wchar-subscripts]

Build: phoenix-rtos-lwip/lib-lwip/src/core/netif.c#L317

array subscript has type 'char' [-Wchar-subscripts]

Build: phoenix-rtos-lwip/lib-lwip/src/core/netif.c#L317

array subscript has type 'char' [-Wchar-subscripts]

Build: phoenix-rtos-lwip/lib-lwip/src/core/netif.c#L318

array subscript has type 'char' [-Wchar-subscripts]

Build: phoenix-rtos-lwip/lib-lwip/src/core/netif.c#L320

array subscript has type 'char' [-Wchar-subscripts]

Build: phoenix-rtos-lwip/lib-lwip/src/core/netif.c#L321

array subscript has type 'char' [-Wchar-subscripts]

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