ENH: upgrade SuperBuild GDAL to 3.2.1

SuperBuild/CMake/External_gdal.cmake

@@ -115,7 +115,7 @@ if(UNIX)
   # For now gdal is built if Superbuild has find python... And only on UNIX
   # That might be a problem
   # User will not be able to override this...
-  if ( OTB_WRAP_PYTHON AND PYTHON_EXECUTABLE)
+  if(OTB_WRAP_PYTHON AND PYTHON_EXECUTABLE)
     list(APPEND GDAL_CONFIGURE_COMMAND "--with-python=${PYTHON_EXECUTABLE}")
   endif()
 
@@ -149,8 +149,8 @@ endif()
 
 ExternalProject_Add(GDAL
   PREFIX GDAL
-  URL "http://download.osgeo.org/gdal/3.1.0/gdal-3.1.0.tar.gz"
-  URL_MD5 bda0f002cd63b51c8d2f1b1400daffa9
+  URL "https://download.osgeo.org/gdal/3.2.1/gdal-3.2.1.tar.xz"
+  URL_MD5 cf7fe042403e73ad991aa5797247b586
   SOURCE_DIR ${GDAL_SB_SRC}
   BINARY_DIR ${GDAL_SB_SRC}
   INSTALL_DIR ${SB_INSTALL_PREFIX}