This fixes a signature mismatch between forward declaration and
implementation, which in turn fixes the following error during
compilation:
/home/maribu/Repos/software/RIOT/build/pkg/wolfssl/wolfcrypt/src/ge_low_mem.c:179:30: error: argument 1 of type 'unsigned char[64]' with mismatched bound [-Werror=array-parameter=]
179 | void sc_reduce(unsigned char x[64])
| ~~~~~~~~~~~~~~^~~~~
In file included from /home/maribu/Repos/software/RIOT/build/pkg/wolfssl/wolfcrypt/src/ge_low_mem.c:34:
/home/maribu/Repos/software/RIOT/build/pkg/wolfssl/wolfssl/wolfcrypt/ge_operations.h:81:36: note: previously declared as 'byte *' {aka 'unsigned char *'}
81 | WOLFSSL_LOCAL void sc_reduce(byte* s);
| ~~~~~~^
