[Bug-ocrad] Incorrect prototype for OCRAD_scale: er ror: unknown type name ‘OCRAD_Descriptor’

[Jakub Wilk]

Hello,

It's currently impossible to compile a file that includes ocradlib.h 
using C compiler:

$ echo '#include <ocradlib.h>' > test.c
$ gcc -c test.c
In file included from test.c:1:0:
/usr/include/ocradlib.h:81:18: error: unknown type name ‘OCRAD_Descriptor’

This is because of a C++ism in OCRAD_scale prototype. Please see the 
attached patch.

--
Jakub Wilk