gnome-build: unnecessary Requires in gnome-build-1.0.pc.in

The gnome-build-1.0.pc.in file in the current SVN head contains:
"Requires:  libgnome-2.0 gtk+-2.0 libxml-2.0 gdl-1.0 gdl-gnome-1.0"

Of these only gtk+-2.0 seems to be necessary. The others appear to be
redundant, since none of the public header files published by
gnome-build contain references to headers from these packages.

Ofcourse the gnome-build libraries link to libxml2.so.2,
libgnome-2.so.0, etc. but when writing a user program using the
gnome-build-devel package one can safely assume that libxml2.so.2,
libgnome-2.so.0, etc are already installed, and need not check for the
*.pc files installed by their corresponding *-devel packages, since
the binary libraries are going to be dependencies of the parent
gnome-build package itself.

What do you think? Am I missing something or this is a bug?

Happy hacking,
Debarshi
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