[pdf-devel] add #ifdef __cplusplus support in pdf.h

[the Adib]

I tried to use the lib in a c++ project but failed because of missing
#ifdef __cplusplus in the header file pdf.h.

Pls add
#ifdef __cplusplus
extern "C" {
#endif

and

#ifdef __cplusplus
}
#endif

to the headers.

I did my own but creating a patch (bzr diff -r ancestor:) fails as
pdf.h is autocreated and not under version control.

Thx,

Adib.