rpm-build: Support macros.d

[dmik]

I found that rpm-build.i386 version 4.8.1-22.oc00 doesn't seem to support automatically loading macros from the /@unixroot/usr/lib/rpm/marcos.d directory.

Some packages install various macros useful for maintaining .spec files. In particular, the texinfo package (info sub package) installs a file called macros.info that contains macros useful for handling documentation in Info format (%info_requires, %info_post, %info_preun) which save some monkey work and about to be used in nearly every .spec file (here is more info: http://trac.netlabs.org/rpm/wiki/RpmHowToPackagers#HandlingdocumentationinInfoformat).

We need to make this mechanism work.

[Yuri Dario]

This feature has been added in rpm 4.10.x, see ​https://bugzilla.redhat.com/show_bug.cgi?id=846679

maybe we can add newer paths (lib/rpmrc.c around#430)

confdir, "/macros.d/macros.*", ":",
confdir, "/fileattrs/*.attr", ":",

to our branch.

[Yuri Dario]

add support for macros.d directory, fixes ticket#119.
Sending rpm-4.8.1/lib/rpmrc.c
Committed revision r558.