Silence warning from Boost regarding non-standard fpos

A fix is upstream but not yet in a release

Framework/Geometry/inc/MantidGeometry/Crystal/MatrixVectorPairParser.h

@@ -12,13 +12,7 @@
 #include "MantidGeometry/DllConfig.h"
 
 #include "MantidKernel/Exception.h"
-#if defined(_MSC_VER)
-#define _SILENCE_FPOS_SEEKPOS_DEPRECATION_WARNING
-#endif
 #include <boost/spirit/include/qi.hpp>
-#if defined(_MSC_VER)
-#undef _SILENCE_FPOS_SEEKPOS_DEPRECATION_WARNING
-#endif
 #include <functional>
 #include <map>
 

Framework/Geometry/test/CMakeLists.txt

@@ -18,6 +18,7 @@ if(CXXTEST_FOUND)
       ../../TestHelpers/src/LoggingCleaner.cpp)
 
   cxxtest_add_test(GeometryTest ${TEST_FILES} ${GMOCK_TEST_FILES})
+  target_compile_definitions(GeometryTest PRIVATE -D_SILENCE_FPOS_SEEKPOS_DEPRECATION_WARNING)
   target_link_libraries(GeometryTest
                         LINK_PRIVATE
                         ${TCMALLOC_LIBRARIES_LINKTIME}