CMake: Removing INT_SIZE variable from presets (#11)

With this change, the default INT_SIZE of the system will be used.
That is compatible with the Make system and default CMake options.

Author: EleniVlachop

build/cmake/presets/base.json

@@ -5,15 +5,13 @@
       "name": "lp64",
       "hidden": true,
       "cacheVariables": {
-        "INT_SIZE": "32",
         "BLAS_INT_SIZE": "32"
       }
     },
     {
       "name": "ilp64",
       "hidden": true,
       "cacheVariables": {
-        "INT_SIZE": "64",
         "BLAS_INT_SIZE": "64"
       }
     },