semihosting: add compat header where is required

ARMCC provides __semihost via compat header. As CMSIS 5.8.0 removed this compat header,
we need to explicitly include it to fix definition missing error.

Author: 0xc0170

platform/source/LocalFileSystem.cpp

@@ -14,6 +14,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#if defined(__ARMCC_VERSION)
+#include <arm_compat.h>
+#endif
+
 #include "platform/LocalFileSystem.h"
 
 #if DEVICE_LOCALFILESYSTEM

platform/source/mbed_semihost_api.c

@@ -14,6 +14,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#if defined(__ARMCC_VERSION)
+#include <arm_compat.h>
+#endif
+
 #include "cmsis.h"
 #include "platform/mbed_semihost_api.h"