cmake: Remove ENABLE_SSE41 from bitcoin-build-config.h

`ENABLE_SSE41` is already conditionally defined for the `bitcoin_crypto`
target, so defining it in `bitcoin-build-config.h` is redundant.

cmake/bitcoin-build-config.h.in

@@ -38,9 +38,6 @@
 /* Define if external signer support is enabled */
 #cmakedefine ENABLE_EXTERNAL_SIGNER 1
 
-/* Define this symbol to build code that uses SSE4.1 intrinsics */
-#cmakedefine ENABLE_SSE41 1
-
 /* Define to 1 to enable tracepoints for Userspace, Statically Defined Tracing
    */
 #cmakedefine ENABLE_TRACING 1