Use fseek/ftell instead of fseeko/ftello when Newlib is the libc

http://reviews.llvm.org/D6626


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@227804 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/fstream b/include/fstream
index 38778c6..ace5eb9 100644
--- a/include/fstream
+++ b/include/fstream
@@ -807,7 +807,7 @@
     default:
         return pos_type(off_type(-1));
     }
-#if _WIN32
+#if defined(_WIN32) || defined(_NEWLIB_VERSION)
     if (fseek(__file_, __width > 0 ? __width * __off : 0, __whence))
         return pos_type(off_type(-1));
     pos_type __r = ftell(__file_);
@@ -826,7 +826,7 @@
 {
     if (__file_ == 0 || sync())
         return pos_type(off_type(-1));
-#if _WIN32
+#if defined(_WIN32) || defined(_NEWLIB_VERSION)
     if (fseek(__file_, __sp, SEEK_SET))
         return pos_type(off_type(-1));
 #else
@@ -891,7 +891,7 @@
                 }
             }
         }
-#if _WIN32
+#if defined(_WIN32) || defined(_NEWLIB_VERSION)
         if (fseek(__file_, -__c, SEEK_CUR))
             return -1;
 #else