Remove SGX demo private key from repo (#1237)

apps/sgx/Makefile

@@ -78,7 +78,7 @@ lib/test_addone.so: $(TVM_ROOT)/src/runtime/sgx/trusted/runtime.cc lib/tvm_t.o l
 
 # The signed enclave
 lib/test_addone.signed.so: lib/test_addone.so enclave_config.xml
-	$(sgx_enclave_signer) sign -key enclave_private.pem -enclave $< -out $@ -config enclave_config.xml
+	$(sgx_enclave_signer) sign -key lib/enclave.pem -enclave $< -out $@ -config enclave_config.xml
 
 clean:
 	rm -rf lib

apps/sgx/prepare_test_libs.py

-"""Script to prepare test_addone_sys.o"""
-
-from os import path as osp
-
-import tvm
-
-CWD = osp.dirname(osp.abspath(osp.expanduser(__file__)))
-
-def prepare_test_libs(base_path):
-    n = tvm.var('n')
-    A = tvm.placeholder((n,), name='A')
-    B = tvm.compute(A.shape, lambda *i: A(*i) + 1, name='B')
-    s = tvm.create_schedule(B.op)
-    s[B].parallel(s[B].op.axis[0])
-    print(tvm.lower(s, [A, B], simple_mode=True))
-
-    # Compile library in system library mode
-    fadd_syslib = tvm.build(s, [A, B], 'llvm --system-lib')
-    syslib_path = osp.join(base_path, 'test_addone_sys.o')
-    fadd_syslib.save(syslib_path)
-
-def main():
-    prepare_test_libs(osp.join(CWD, 'lib'))
-
-if __name__ == '__main__':
-    main()