Merge #135: cmake: Don not enable unneeded ASM language

728b775 fixup! cmake: Add root `CMakeLists.txt` file (Hennadii Stepanov)

Pull request description:

  We have no assembly source files in the codebase.

  The only one is `src/secp256k1/src/asm/field_10x26_arm.s`, but it is not used in Bitcoin Core.

ACKs for top commit:
  pablomartin4btc:
    ACK 728b775

Tree-SHA512: d56570b8364aa9e44b56e247d95550ef5b8023f1b0ff7cb41706292ec6946af5304fbed823edb3d267684aab3bea4c429294472e2d4cd9701a1465309c4869cb

CMakeLists.txt

@@ -29,7 +29,7 @@ project(BitcoinCore
   VERSION ${CLIENT_VERSION_MAJOR}.${CLIENT_VERSION_MINOR}.${CLIENT_VERSION_BUILD}
   DESCRIPTION "Bitcoin client software"
   HOMEPAGE_URL "https://bitcoincore.org/"
-  LANGUAGES CXX ASM
+  LANGUAGES CXX
 )
 
 set(PACKAGE_VERSION ${PROJECT_VERSION})