Make Android's ctype_base::mask unsigned.

Keeping the regex code sane is much easier if we match the other
platforms and use an unsigned mask.



git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@214442 91177308-0d34-0410-b5e6-96231b3b80d8

include/__locale

@@ -356,7 +356,7 @@ public:
 #elif defined(__EMSCRIPTEN__) ||  defined(__NetBSD__)
     typedef unsigned short mask;
 #elif defined(__ANDROID__)
-    typedef char mask;
+    typedef unsigned char mask;
 #endif
     static const mask space  = _CTYPE_S;
     static const mask print  = _CTYPE_R;

src/locale.cpp

@@ -1038,7 +1038,7 @@ ctype<char>::classic_table()  _NOEXCEPT
 #elif defined(_AIX)
     return (const unsigned int *)__lc_ctype_ptr->obj->mask;
 #elif defined(__ANDROID__)
-    return _ctype_ + 1;
+    return reinterpret_cast<const unsigned char*>(_ctype_) + 1;
 #else
     // Platform not supported: abort so the person doing the port knows what to
     // fix