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

`ENABLE_ARM_SHANI` 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

@@ -29,9 +29,6 @@
 /* Copyright year */
 #define COPYRIGHT_YEAR @COPYRIGHT_YEAR@
 
-/* Define this symbol to build code that uses ARMv8 SHA-NI intrinsics */
-#cmakedefine ENABLE_ARM_SHANI 1
-
 /* Define if external signer support is enabled */
 #cmakedefine ENABLE_EXTERNAL_SIGNER 1
 

cmake/introspection.cmake

@@ -217,5 +217,4 @@ if(NOT MSVC)
     " HAVE_ARM_SHANI
     CXXFLAGS ${ARM_SHANI_CXXFLAGS}
   )
-  set(ENABLE_ARM_SHANI ${HAVE_ARM_SHANI})
 endif()

src/crypto/sha256.cpp

@@ -2,8 +2,6 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include <bitcoin-build-config.h> // IWYU pragma: keep
-
 #include <crypto/sha256.h>
 #include <crypto/common.h>
 

test/lint/test_runner/src/main.rs

@@ -614,12 +614,7 @@ fn lint_includes_build_config() -> LintResult {
                     "*.cpp",
                     "*.h",
                 ])
-                .args(get_pathspecs_default_excludes())
-                .args([
-                    // These are exceptions which don't use bitcoin-build-config.h, rather CMakeLists.txt adds
-                    // these cppflags manually.
-                    ":(exclude)src/crypto/sha256_arm_shani.cpp",
-                ]),
+                .args(get_pathspecs_default_excludes()),
         )
         .expect("grep failed");
         git()