CPP: Fix the nulltermination test.

Author: geoffw0

cpp/ql/test/library-tests/nulltermination/test.c

@@ -3,14 +3,14 @@
 #define va_arg(x, y) ((y)x)
 #define va_end(x)
 #define NULL 0
-
 char* strcat(char* destination, const char* source);
 char* strcpy(char* destination, const char* source);
 int strlen(const char* str);
 char* strcpy(char* destination, const char* source);
-
+char* strstr(char* s1, const char* s2);
+const char* strchr(const char* s, int c);
+int strcmp(const char *s1, const char *s2);
 char* global = "         ";
-
 void addNull(char* buffer) {
   buffer[0] = '\0';
 }