Remove code that redefines standard types on specific architectures

This is a left-over from the old build system.  For some explicitly given
architectures, UINT is not unsigned int, for example.  The special-casing
stopped working when we moved to the AutoTools long time ago, but hardly
anybody noticed because amd64 worked anyway.  Now this old code gives
us trouble building dune-grid on Debian ppc64el.  Since I don't even
know why these types need to be changed, and what the requirements on
the types are, I just kick out all the special cases.  If something
goes wrong we can then fix it in a portable way.

low/ugtypes.h

@@ -18,30 +18,6 @@
 
 START_UG_NAMESPACE
 
-#if defined __DEC__ || defined __LINUXAXP__ || defined __LINUXIA64__ || defined __AMD64__ || defined __PPC64__
-
-typedef short SHORT;
-/* With the old build system we want INT to have the same size as void* */
-typedef long INT;
-typedef unsigned long UINT;
-typedef float FLOAT;
-typedef double DOUBLE;
-typedef float COORD;
-typedef float SCREEN_COORD;
-
-#elif defined __NECSX4__ || defined __SR2201__ || defined __SR8K__
-
-typedef short SHORT;
-/* With the old build system we want INT to have the same size as void* */
-typedef long INT;
-typedef unsigned long UINT;
-typedef float FLOAT;
-typedef double DOUBLE;
-typedef double COORD;
-typedef float SCREEN_COORD;
-
-#else
-
 /* standard types */
 
 typedef short SHORT;
@@ -56,8 +32,6 @@ typedef double DOUBLE;
 typedef float COORD;
 typedef float SCREEN_COORD;
 
-#endif
-
 END_UG_NAMESPACE
 
 #endif