crypto: armv7: slow-hash: remove redundant source include

aesb.c is already present in libcrypto as a standalone object.
Tested: builds and runs fine on armv7, static and dynamic.

src/crypto/slow-hash.c

@@ -939,7 +939,6 @@ void cn_slow_hash(const void *data, size_t length, char *hash)
 
 // ND: Some minor optimizations for ARMv7 (raspberrry pi 2), effect seems to be ~40-50% faster.
 //     Needs more work.
-#include "aesb.c"
 
 #ifdef NO_OPTIMIZED_MULTIPLY_ON_ARM
 /* The asm corresponds to this C code */