Remove WASM32_* const definitions

The const definitions in `stdio.h` are causing the `wasm-pack` build to
fail due to 'duplicate symbol' errors. This can be solved by just
removing the definitions.

Author: tcharding

secp256k1-sys/wasm-sysroot/stdio.h

@@ -1,17 +0,0 @@
-#include <stddef.h>
-#define alignof(type) offsetof (struct { char c; type member; }, member)
-
-extern const unsigned char WASM32_INT_SIZE = sizeof(int);
-extern const unsigned char WASM32_INT_ALIGN = alignof(int);
-
-extern const unsigned char WASM32_UNSIGNED_INT_SIZE = sizeof(unsigned int);
-extern const unsigned char WASM32_UNSIGNED_INT_ALIGN = alignof(unsigned int);
-
-extern const unsigned char WASM32_SIZE_T_SIZE = sizeof(size_t);
-extern const unsigned char WASM32_SIZE_T_ALIGN = alignof(size_t);
-
-extern const unsigned char WASM32_UNSIGNED_CHAR_SIZE = sizeof(unsigned char);
-extern const unsigned char WASM32_UNSIGNED_CHAR_ALIGN = alignof(unsigned char);
-
-extern const unsigned char WASM32_PTR_SIZE = sizeof(void*);
-extern const unsigned char WASM32_PTR_ALIGN = alignof(void*);