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curl_ntlm_core: pass unsigned char to toupper

Otherwise, clang on Cygwin64 warns:
curl_ntlm_core.c:525:35: error: array subscript is of type 'char'
[-Werror,-Wchar-subscripts]
    dest[2 * i] = (unsigned char)(toupper(src[i]));
                                  ^~~~~~~~~~~~~~~
/usr/include/ctype.h:152:25: note: expanded from macro 'toupper'
      (void) __CTYPE_PTR[__x]; (toupper) (__x);})
                        ^~~~

1 of 1 new or added line in 1 file covered. (100.0%)

18157 of 25122 relevant lines covered (72.28%)

43265.63 hits per line