use strlcpy & strlcat (#74) * refactor checkpubkeyperms() with safe BSD functions fix gcc8 warnings ``` svr-authpubkey.c: In function 'checkpubkeyperms': svr-authpubkey.c:427:2: warning: 'strncat' specified bound 5 equals source length [-Wstringop-overflow=] strncat(filename, "/.ssh", 5); /* strlen("/.ssh") == 5 */ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ svr-authpubkey.c:433:2: warning: 'strncat' specified bound 16 equals source length [-Wstringop-overflow=] strncat(filename, "/authorized_keys", 16); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ``` see https://www.sudo.ws/todd/papers/strlcpy.html * restore strlcpy in xstrdup see original https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/xmalloc.c?rev=1.16

CFLAGS += -I../src/headers -I./ 
CC=icc

OBJECTS = base64_test.o cipher_hash_test.o der_tests.o                                   \
dsa_test.o ecc_test.o mac_test.o modes_test.o pkcs_1_test.o rsa_test.o                   \
store_test.o test_driver.o x86_prof.o katja_test.o

ifndef LIBTEST_S
   LIBTEST_S = libtomcrypt_prof.a
endif

default: $(LIBTEST_S)

$(LIBTEST_S): $(OBJECTS)
	$(AR) $(ARFLAGS) $@ $(OBJECTS)
	ranlib $@

clean:
	rm -f *.o *.a