The p256k1/update tool should apply patches

[sergey-shandar]

• [x] remove static from C source code for some selected functions.
• [x] add external include to a header file with prefixes.
• [x] fix secp256k1_ge_set_gej

[sergey-shandar]

@xoloki I think, we can export static and inline functions by defining new functions, for example, instead of replacing

// secp256k1.h
SECP256K1_INLINE static void secp256k1_fe_add(secp256k1_fe *r, const secp256k1_fe *a) {

to

// secp256k1.h
static void secp256k1_fe_add(secp256k1_fe *r, const secp256k1_fe *a) {

we can create a new external (non static) function

// secp256k1_extension.h
#include <secp256k1.h>
SECP256K1 void prefix_secp256k1_fe_add(secp256k1_fe *r, const secp256k1_fe *a);

// secp256k1_extension.c
#include <secp256k1_extension.h>
SECP256K1 void prefix_secp256k1_fe_add(secp256k1_fe *r, const secp256k1_fe *a) {
    secp256k1_fe_add(r, a);
}

[xoloki]

That should work, and it would be much cleaner.

[sergey-shandar]

That should work, and it would be much cleaner.

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