Update little-to-big endian GetSwapFloat functions

rSt >> pPtr[3] >> pPtr[2] >> pPtr[1] >> pPtr[0] results in error:
  no match for 'operator>>' in 'rSt >> *(pPtr + 3u)'

Change-Id: I1820bac8c72f7633ab01a17bf5d073b988e1b58c
Reviewed-on: https://gerrit.libreoffice.org/8207Tested-by: Michael Stahl <mstahl@redhat.com>
Reviewed-by: Michael Stahl <mstahl@redhat.com>

cppcanvas/source/inc/implrenderer.hxx

@@ -137,12 +137,15 @@ namespace cppcanvas
             }
 
 #ifdef OSL_BIGENDIAN
-// currently unused
+// little endian <-> big endian switch
 static float GetSwapFloat( SvStream& rSt )
 {
         float   fTmp;
         sal_Int8* pPtr = (sal_Int8*)&fTmp;
-        rSt >> pPtr[3] >> pPtr[2] >> pPtr[1] >> pPtr[0];        // Little Endian <-> Big Endian switch
+        rSt.ReadSChar( pPtr[3] );
+        rSt.ReadSChar( pPtr[2] );
+        rSt.ReadSChar( pPtr[1] );
+        rSt.ReadSChar( pPtr[0] );
         return fTmp;
 }
 #endif

vcl/source/filter/wmf/enhwmf.cxx

@@ -155,12 +155,15 @@ using namespace std;
 
 
 #ifdef OSL_BIGENDIAN
-// currently unused
+// little endian <-> big endian switch
 static float GetSwapFloat( SvStream& rSt )
 {
     float   fTmp;
     sal_Int8* pPtr = (sal_Int8*)&fTmp;
-    rSt >> pPtr[3] >> pPtr[2] >> pPtr[1] >> pPtr[0];    // little endian <-> big endian switch
+    rSt.ReadSChar( pPtr[3] );
+    rSt.ReadSChar( pPtr[2] );
+    rSt.ReadSChar( pPtr[1] );
+    rSt.ReadSChar( pPtr[0] );
     return fTmp;
 }
 #endif