Remove broken inttypes.h

src/common/inttypes.h is a shim to fix building cc65 on
non-C99-compliant compilers missing inttypes.h (like VS2012 and
earlier). The shim is actually incomplete and does not define the PRI...
macros supplied by the actual compiler headers. Since we're planning to
use those macros, delete this header so cc65's source files instead use
host-supplied inttypes.h containing macro definitions.

src/common.vcxproj

@@ -74,7 +74,6 @@
     <ClInclude Include="common\inline.h" />
     <ClInclude Include="common\intptrstack.h" />
     <ClInclude Include="common\intstack.h" />
-    <ClInclude Include="common\inttypes.h" />
     <ClInclude Include="common\libdefs.h" />
     <ClInclude Include="common\lidefs.h" />
     <ClInclude Include="common\matchpat.h" />