Compiler Warnings from HSD

  CC(target) Release/obj.target/bcrypto/src/secp256k1/src/secp256k1.o
In file included from ../src/secp256k1/src/scalar_impl.h:20:0,
                 from ../src/secp256k1/src/secp256k1.c:12:
../src/secp256k1/src/scalar_4x64_impl.h: In function 'secp256k1_scalar_chacha20':
../src/secp256k1/src/scalar_4x64_impl.h:969:5: warning: implicit declaration of function 'memcpy' [-Wimplicit-function-declaration]
     memcpy((void *) seed32, (const void *) seed, 32);
     ^~~~~~
../src/secp256k1/src/scalar_4x64_impl.h:969:5: warning: incompatible implicit declaration of built-in function 'memcpy'
../src/secp256k1/src/scalar_4x64_impl.h:969:5: note: include '<string.h>' or provide a declaration of 'memcpy'
In file included from ../src/secp256k1/src/secp256k1.c:15:0:
../src/secp256k1/src/ecmult_const_impl.h: In function 'secp256k1_wnaf_const.constprop':
../src/secp256k1/src/ecmult_const_impl.h:113:20: warning: 'u' may be used uninitialized in this function [-Wmaybe-uninitialized]
     wnaf[word] = u * global_sign;
                  ~~^~~~~~~~~~~~~
../src/secp256k1/src/secp256k1.c: At top level:
cc1: warning: unrecognized command line option '-Wno-unknown-warning'
cc1: warning: unrecognized command line option '-Wno-implicit-fallthrough'

...


CC(target) Release/obj.target/goosig/src/goo/goo.o
../src/goo/goo.c: In function 'goo_group_hash':
../src/goo/goo.c:2148:28: warning: initializer element is not computable at load time [-Wpedantic]
   unsigned char sign[1] = {mpz_sgn(E) < 0 ? 1 : 0};
                            ^~~~~~~
../src/goo/goo.c: At top level:
cc1: warning: unrecognized command line option '-Wno-unknown-warning'