gh-131418: remove unused legacy typedefs in {md5,sha1}module.c (#131420)

- Remove legacy typedefs `MD5_INT32` and `MD5_INT64` in `Modules/md5module.c`
- Remove legacy typedefs `SHA1_INT32` and `SHA1_INT64` in `Modules/sha1module.c`.

Those legacy typedefs were used to detect whether the host platform could
correctly implement MD5 and SHA-1, but this is no longer needed as we now
fallback to HACL* implementations.

Author: picnixz

Modules/md5module.c

@@ -29,15 +29,6 @@ class MD5Type "MD5object *" "&PyType_Type"
 [clinic start generated code]*/
 /*[clinic end generated code: output=da39a3ee5e6b4b0d input=6e5261719957a912]*/
 
-/* Some useful types */
-
-#if SIZEOF_INT == 4
-typedef unsigned int MD5_INT32; /* 32-bit integer */
-typedef long long MD5_INT64; /* 64-bit integer */
-#else
-/* not defined. compilation will die. */
-#endif
-
 /* The MD5 block size and message digest sizes, in bytes */
 
 #define MD5_BLOCKSIZE    64

Modules/sha1module.c

@@ -30,15 +30,6 @@ class SHA1Type "SHA1object *" "&PyType_Type"
 [clinic start generated code]*/
 /*[clinic end generated code: output=da39a3ee5e6b4b0d input=3dc9a20d1becb759]*/
 
-/* Some useful types */
-
-#if SIZEOF_INT == 4
-typedef unsigned int SHA1_INT32;        /* 32-bit integer */
-typedef long long SHA1_INT64;        /* 64-bit integer */
-#else
-/* not defined. compilation will die. */
-#endif
-
 /* The SHA1 block size and message digest sizes, in bytes */
 
 #define SHA1_BLOCKSIZE    64