Update Makefile of dnnl for unattended installs

The proposed change makes it easier to perform unattended installations in e.g. docker containers or VMs.
The `git am` command applies patches and attempts to commit the changes.
Yet, in order to commit git requires `user.name` and `user.email` to be configured, which are both usually not set in containers or VMs.

Based on my testing it is enough to simply apply the patch to avoid git asking for the user's name and email.

Signed-off-by: Muhammad El-Hindi muhammad.el-hindi@cs.tu-darmstadt.com

Author: melhindi

external/dnnl/Makefile

@@ -81,11 +81,11 @@ dnnl_src:
 ifeq ($(shell git rev-parse --is-inside-work-tree), true)
 	@$(RM) -r $(DNNL_DIR)/*
 	git submodule update -f --init dnnl
-	cd $(DNNL_DIR) && git am ../sgx_dnnl.patch
+	cd $(DNNL_DIR) && git apply ../sgx_dnnl.patch
 else
 	@$(RM) -r $(DNNL_DIR)
 	git clone https://github.com/intel/mkl-dnn.git -b v1.1.1 --depth 1  $(DNNL_DIR)
-	cd $(DNNL_DIR) && git am ../sgx_dnnl.patch
+	cd $(DNNL_DIR) && git apply ../sgx_dnnl.patch
 endif
 
 $(LIBDNNL):$(CHECK_SOURCE)