SuperBuild: use cmake boolean to check x86 and x64 compiler arch

SuperBuild/CMake/External_curl.cmake

@@ -15,10 +15,10 @@ if(MSVC)
     return()
   endif()
 
-if("${OTB_MSVC_COMPILER_ARCH}" MATCHES "x86")
-  set(CURL_INSTALL_DIR_PREFIX "libcurl-vc-x86")
-else()
+if(OTB_MSVC_COMPILER_ARCH_IS_X64)
   set(CURL_INSTALL_DIR_PREFIX "libcurl-vc-x64")
+else()
+  set(CURL_INSTALL_DIR_PREFIX "libcurl-vc-x86")
 endif()
 
   set(CURL_INSTALL_DIR_PREFIX "${CURL_INSTALL_DIR_PREFIX}-release-dll-zlib-dll-ipv6-sspi-winssl")

SuperBuild/CMake/External_gdal.cmake

@@ -95,7 +95,7 @@ else(MSVC)
   ${CMAKE_SOURCE_DIR}/patches/GDAL/nmake_gdal_extra.opt.in 
   ${CMAKE_BINARY_DIR}/nmake_gdal_extra.opt)
   
-  if("${OTB_MSVC_COMPILER_ARCH}" MATCHES "x64")
+  if(OTB_MSVC_COMPILER_ARCH_IS_X64)
     file(APPEND "${CMAKE_BINARY_DIR}/nmake_gdal_extra.opt" "WIN64=YES")
   endif()
   

SuperBuild/CMakeLists.txt

@@ -30,9 +30,9 @@ if(MSVC)
   OUTPUT_QUIET
   OUTPUT_STRIP_TRAILING_WHITESPACE)
   
-  set(OTB_MSVC_COMPILER_ARCH x64)
+  set(OTB_MSVC_COMPILER_ARCH_IS_X64 TRUE)
   if("${ev}" MATCHES "x86")
-    set(OTB_MSVC_COMPILER_ARCH x86)
+    set(OTB_MSVC_COMPILER_ARCH_IS_X64 FALSE)
   endif()
   
 endif()