Fix ssize_t, WCHAR_MIN and WCHAR_MAX

1) ssize_t is int, instead of long int
2) WCHAR_MIN and WCHAR_MAX be consistent with bionic's:
   respond to __WCHAR_UNSIGNED__, work for both signed (X86/MIPS)
   and unsigned (ARM) wchar_t, and work for -fshort-wchar too

Change-Id: Ief1be007571b50c5d63a819df489f9d3f9b47bc8

ndk/platforms/android-3/include/stdint.h

@@ -251,7 +251,7 @@ typedef int64_t  intmax_t;
 /* size_t is defined by the GCC-specific <stddef.h> */
 #ifndef _SSIZE_T_DEFINED_
 #define _SSIZE_T_DEFINED_
-typedef long int  ssize_t;
+typedef int  ssize_t;
 #endif
 
 #define _BITSIZE 32

ndk/platforms/android-3/include/sys/_wchar_limits.h

@@ -86,21 +86,14 @@
 #  else
   /* Otherwise, the value is derived from the toolchain configuration.
    * to avoid putting explicit CPU checks in this header. */
-#    ifndef __WCHAR_MAX__
-#      error "__WCHAR_MAX__ is not defined. Check your toolchain!"
+#    define WCHAR_MAX __WCHAR_MAX__
+
+  /* Clang does not define __WCHAR_MIN__ */
+#    if defined(__WCHAR_UNSIGNED__)
+#      define WCHAR_MIN L'\0'
+#    else
+#      define WCHAR_MIN (-(WCHAR_MAX) - 1)
 #    endif
-  /* Clang does define __WCHAR_MAX__, but not __WCHAR_MIN__ */
-#    ifndef __WCHAR_MIN__
-#      if __WCHAR_MAX__ == 4294967295
-#        define __WCHAR_MIN__  (0U)
-#      elif __WCHAR_MAX__ == 2147483647
-#        define __WCHAR_MIN__  (-2147483647 - 1)
-#      else
-#        error "Invalid __WCHAR_MAX__ value. Check your toolchain!"
-#      endif
-#    endif /* !__WCHAR_MIN__ */
-#    define WCHAR_MIN    __WCHAR_MIN__
-#    define WCHAR_MAX    __WCHAR_MAX__
 #  endif /* !_WCHAR_IS_ALWAYS_SIGNED */
 
 #endif /* !WCHAR_MIN */

ndk/platforms/android-3/include/sys/types.h

@@ -87,7 +87,7 @@ typedef  .... pthread_t;
 
 #ifndef _SSIZE_T_DEFINED_
 #define _SSIZE_T_DEFINED_
-typedef long int  ssize_t;
+typedef int  ssize_t;
 #endif
 
 typedef __kernel_suseconds_t  suseconds_t;