Remove unused stream methods

They were accidentally left unused in fbad8a9 so they haven't been used
in some time.

common/rdr/FdInStream.cxx

@@ -53,8 +53,7 @@
 
 using namespace rdr;
 
-enum { DEFAULT_BUF_SIZE = 8192,
+enum { DEFAULT_BUF_SIZE = 8192 };
-       MIN_BULK_SIZE = 1024 };
 
 FdInStream::FdInStream(int fd_, int timeoutms_, size_t bufSize_,
                        bool closeWhenDone_)
@@ -97,32 +96,6 @@ size_t FdInStream::pos()
   return offset + ptr - start;
 }
 
-void FdInStream::readBytes(void* data, size_t length)
-{
-  if (length < MIN_BULK_SIZE) {
-    InStream::readBytes(data, length);
-    return;
-  }
-
-  U8* dataPtr = (U8*)data;
-
-  size_t n = end - ptr;
-  if (n > length) n = length;
-
-  memcpy(dataPtr, ptr, n);
-  dataPtr += n;
-  length -= n;
-  ptr += n;
-
-  while (length > 0) {
-    n = readWithTimeoutOrCallback(dataPtr, length);
-    dataPtr += n;
-    length -= n;
-    offset += n;
-  }
-}
-
-
 size_t FdInStream::overrun(size_t itemSize, size_t nItems, bool wait)
 {
   if (itemSize > bufSize)

common/rdr/FdInStream.h

@@ -47,7 +47,6 @@ namespace rdr {
     void setBlockCallback(FdInStreamBlockCallback* blockCallback);
     int getFd() { return fd; }
     size_t pos();
-    void readBytes(void* data, size_t length);
 
     void startTiming();
     void stopTiming();

common/rdr/MemOutStream.h

@@ -41,12 +41,6 @@ namespace rdr {
       delete [] start;
     }
 
-    void writeBytes(const void* data, size_t length) {
-      check(length);
-      memcpy(ptr, data, length);
-      ptr += length;
-    }
-
     size_t length() { return ptr - start; }
     void clear() { ptr = start; };
     void clearAndZero() { memset(start, 0, ptr-start); clear(); }