Add str* functions to cstdlib/stdlib.h headers

Author: lcartey

cpp/common/test/includes/standard-library/cstdlib

@@ -15,5 +15,12 @@ using ::free;
 using ::malloc;
 using ::quick_exit;
 using ::rand;
+using ::strtod;
+using ::strtof;
+using ::strtol;
+using ::strtold;
+using ::strtoll;
+using ::strtoul;
+using ::strtoull;
 } // namespace std
 #endif // _GHLIBCPP_CSTDLIB

cpp/common/test/includes/standard-library/stdlib.h

@@ -26,6 +26,14 @@ long int atol(const char *str);
 long long int atoll(const char *str);
 double atof(const char *str);
 
+long int strtol(const char *str, char **endptr, int base);
+long long int strtoll(const char *str, char **endptr, int base);
+unsigned long int strtoul(const char *str, char **endptr, int base);
+unsigned long long int strtoull(const char *str, char **endptr, int base);
+double strtod(const char *str, char **endptr);
+float strtof(const char *str, char **endptr);
+long double strtold(const char *str, char **endptr);
+
 int rand(void);
 
 #endif // _GHLIBCPP_STDLIB