cmake HAVE_ARM32_ASM examples

XRPLF/rippled external/secp256k1/cmake/CheckArm32Assembly.cmake :2 

try_compile(HAVE_ARM32_ASM
    ${PROJECT_BINARY_DIR}/check_arm32_assembly
    SOURCES ${PROJECT_SOURCE_DIR}/cmake/source_arm32.s
  )

bitcoin-sv/bitcoin-sv src/secp256k1/cmake/CheckArm32Assembly.cmake :2 

try_compile(HAVE_ARM32_ASM
    ${CMAKE_BINARY_DIR}/check_arm32_assembly
    SOURCES ${CMAKE_SOURCE_DIR}/cmake/source_arm32.s
  )