Fix Windows batch file
Fix Windows batch file

Fixes for the Windows mbedTLS patch batch script:
- Do not assume fixed directory layout to find patch.exe in Git installation.
- Use different variable as GIT_LOCATION is apparently also used
  by Git itself.

Change-Id: I69b0199431dd86cc3bb18779440fbb849b227f74
Signed-off-by: Andreas Zisowsky <0f8ec8760f6bbf76e7fa9ba97460a7a7c7a7e80e@lynxtechnology.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/26409
Reviewed-on: https://gerrit.iotivity.org/gerrit/26411
Tested-by: IoTivity Jenkins <6267f6022d49a8a37a7fe97da24aebfab797522c@iotivity.org>
Reviewed-by: George Nash <acbdc39d528a4315fe0b532d55c50ae46f5c1667@intel.com>
Reviewed-by: Kishen Maloor <c62ddea3cd661a9268bff15f07fc2229cdc9ac02@intel.com>

iotivity/iotivity-constrained,iotivity/iotivity-constrained,iotivity/iotivity-constrained,iotivity/iotivity-constrained