"LWIP_NO_CTYPE_H" redefined
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Description
3.1.2/tools/sdk/lwip2/include/lwip/arch.h defines LWIP_NO_CTYPE_H on line 215:
```
214 | #ifndef LWIP_NO_CTYPE_H
215 | #define LWIP_NO_CTYPE_H 0
216 | #endif
```
3.1.2/tools/sdk/lwip2/include/arch/cc.h then defines it again on line 68:
`68 | #define LWIP_NO_CTYPE_H 1`
Result is an redefine error.
Wrapping with an #ifndef removes the warning and the sketch compiles ok, but I'm unsure if this is the right thing to do.
```
68 | #ifndef LWIP_NO_CTYPE_H
69 | #define LWIP_NO_CTYPE_H 1
70 | #endif
```
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