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tests/libc: Fix 0026-strstr test

When the substring is an empty string strstr() must return
a pointer to the beginning of the string, and there were
several checks that were assuming a different behaviour.

--- a/tests/libc/execute/0026-strstr.c

+++ b/tests/libc/execute/0026-strstr.c

@@ -22,8 +22,9 @@

 	strcpy(buf, "ababc");

 	assert(strstr(buf, "abc") == buf+2);

 	assert(strstr("", "abc") == NULL);

-	assert(strstr("abc", "") == NULL);

-	assert(strstr("", "") == NULL);

+	assert(strstr(buf, "") == buf);

+	buf[0] = '\0';

+	assert(strstr(buf, "") == buf);

 	puts("done");

 	return 0;