Use sysconf(_SC_PAGESIZE) instead of getpagesize().

Bug: 11563061
Change-Id: I1350f0b1cb8e2bf17cdce34b7429763bbb6b2856

native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.cpp

@@ -35,7 +35,7 @@ namespace latinime {
         AKLOGE("DICT: Can't open the source. path=%s errno=%d", path, errno);
         return MmappedBufferPtr(0);
     }
-    const int pagesize = getpagesize();
+    const int pagesize = sysconf(_SC_PAGESIZE);
     const int offset = bufferOffset % pagesize;
     int alignedOffset = bufferOffset - offset;
     int alignedSize = bufferSize + offset;