FindBoost: Update MSVC architecture check code style

Modules/FindBoost.cmake

@@ -1461,14 +1461,14 @@ if(NOT "x${CMAKE_CXX_COMPILER_ARCHITECTURE_ID}" STREQUAL "x" AND NOT Boost_VERSI
   string(APPEND _boost_ARCHITECTURE_TAG "-")
   # This needs to be kept in-sync with the section of CMakePlatformId.h.in
   # inside 'defined(_WIN32) && defined(_MSC_VER)'
-  if(${CMAKE_CXX_COMPILER_ARCHITECTURE_ID} STREQUAL "IA64")
+  if(CMAKE_CXX_COMPILER_ARCHITECTURE_ID STREQUAL "IA64")
     string(APPEND _boost_ARCHITECTURE_TAG "i")
-  elseif(${CMAKE_CXX_COMPILER_ARCHITECTURE_ID} STREQUAL "X86"
-            OR ${CMAKE_CXX_COMPILER_ARCHITECTURE_ID} STREQUAL "x64")
+  elseif(CMAKE_CXX_COMPILER_ARCHITECTURE_ID STREQUAL "X86"
+            OR CMAKE_CXX_COMPILER_ARCHITECTURE_ID STREQUAL "x64")
     string(APPEND _boost_ARCHITECTURE_TAG "x")
-  elseif(${CMAKE_CXX_COMPILER_ARCHITECTURE_ID} MATCHES "^ARM")
+  elseif(CMAKE_CXX_COMPILER_ARCHITECTURE_ID MATCHES "^ARM")
     string(APPEND _boost_ARCHITECTURE_TAG "a")
-  elseif(${CMAKE_CXX_COMPILER_ARCHITECTURE_ID} STREQUAL "MIPS")
+  elseif(CMAKE_CXX_COMPILER_ARCHITECTURE_ID STREQUAL "MIPS")
     string(APPEND _boost_ARCHITECTURE_TAG "m")
   endif()