Adding cython v0.20.2 in third-party.

third_party/cython/src/Cython/Includes/libc/stdlib.pxd

+# 7.20 General utilities <stdlib.h>
+
+# deprecated cimports for backwards compatibility:
+from libc.string cimport const_char, const_void
+
+
+cdef extern from "stdlib.h" nogil:
+
+    # 7.20.1 Numeric conversion functions
+    int atoi (const char *string)
+    long atol (const char *string)
+    long long atoll (const char *string)
+    double atof (const char *string)
+    long strtol (const char *string, char **tailptr, int base)
+    unsigned long int strtoul (const char *string, char **tailptr, int base)
+    long long int strtoll (const char *string, char **tailptr, int base)
+    unsigned long long int strtoull (const char *string, char **tailptr, int base)
+    float strtof (const char *string, char **tailptr)
+    double strtod (const char *string, char **tailptr)
+    long double strtold (const char *string, char **tailptr)
+
+    # 7.20.2 Pseudo-random sequence generation functions
+    enum: RAND_MAX
+    int rand ()
+    void srand (unsigned int seed)
+
+    # 7.20.3 Memory management functions
+    void *calloc (size_t count, size_t eltsize)
+    void free (void *ptr)
+    void *malloc (size_t size)
+    void *realloc (void *ptr, size_t newsize)
+
+    # 7.20.4 Communication with the environment
+    enum: EXIT_FAILURE
+    enum: EXIT_SUCCESS
+    void exit (int status)
+    void _exit (int status)
+    int atexit (void (*function) ())
+    void abort ()
+    char *getenv (const char *name)
+    int system (const char *command)
+
+    #7.20.5 Searching and sorting utilities
+    void *bsearch (const void *key, const void *array,
+                   size_t count, size_t size,
+                   int (*compare)(const void *, const void *))
+    void qsort (void *array, size_t count, size_t size,
+                int (*compare)(const void *, const void *))
+
+    # 7.20.6 Integer arithmetic functions
+    int abs (int number)
+    long int labs (long int number)
+    long long int llabs (long long int number)
+    ctypedef struct div_t:
+        int quot
+        int rem
+    div_t div (int numerator, int denominator)
+    ctypedef struct ldiv_t:
+        long int quot
+        long int rem
+    ldiv_t ldiv (long int numerator, long int denominator)
+    ctypedef struct lldiv_t:
+        long long int quot
+        long long int rem
+    lldiv_t lldiv (long long int numerator, long long int denominator)
+
+
+    # 7.20.7 Multibyte/wide character conversion functions
+    # XXX TODO
+
+    # 7.20.8 Multibyte/wide string conversion functions
+    # XXX TODO