Create extra symbolic links for debuginfo files with the same build id

[rzinsly]

There are cases where the build ID is not really unique, such as in the following files:

/opt/atx.x/bin/getconf
/opt/atx.x/libexec64/getconf/POSIX_V7_LP64_OFF64
/opt/atx.x/libexec64/getconf/XBS5_LP64_OFF64
/opt/atx.x/libexec64/getconf/POSIX_V6_LP64_OFF64

On Fedora, when such collisions happen, the debuginfo packages create extra symlinks to the files with the same build-id, as shown below:

Package: glibc:
/usr/libexec/getconf/POSIX_V6_LP64_OFF64
/usr/libexec/getconf/POSIX_V7_LP64_OFF64
/usr/libexec/getconf/XBS5_LP64_OFF64

Package: glibc-common:
/usr/bin/getconf

Package: glibc-debuginfo:
/usr/lib/debug/.build-id/1f/44e690889e68bd31952a980999896e4f7d28d5 -> ../../../../libexec/getconf/POSIX_V6_LP64_OFF64
/usr/lib/debug/.build-id/1f/44e690889e68bd31952a980999896e4f7d28d5.1 -> ../../../../libexec/getconf/XBS5_LP64_OFF64
/usr/lib/debug/.build-id/1f/44e690889e68bd31952a980999896e4f7d28d5.1.debug -> ../../usr/libexec/getconf/XBS5_LP64_OFF64.debug
/usr/lib/debug/.build-id/1f/44e690889e68bd31952a980999896e4f7d28d5.2 -> ../../../../libexec/getconf/POSIX_V7_LP64_OFF64
/usr/lib/debug/.build-id/1f/44e690889e68bd31952a980999896e4f7d28d5.2.debug -> ../../usr/libexec/getconf/POSIX_V7_LP64_OFF64.debug
/usr/lib/debug/.build-id/1f/44e690889e68bd31952a980999896e4f7d28d5.debug -> ../../usr/libexec/getconf/POSIX_V6_LP64_OFF64.debug

Package: glibc-debuginfo-common:
/usr/lib/debug/.build-id/1f/44e690889e68bd31952a980999896e4f7d28d5.3 -> ../../../../bin/getconf
/usr/lib/debug/.build-id/1f/44e690889e68bd31952a980999896e4f7d28d5.3.debug -> ../../usr/bin/getconf.debug
/usr/lib/debug/usr/libexec/getconf/POSIX_V6_LP64_OFF64.debug
/usr/lib/debug/usr/libexec/getconf/POSIX_V7_LP64_OFF64.debug
/usr/lib/debug/usr/libexec/getconf/XBS5_LP64_OFF64.debug
/usr/lib/debug/usr/bin/getconf.debug

We want to do the same thing on the advance toolchain, i.e.:

Create extra symbolic links for debuginfo files with the same build id. To avoid filename collision, add a suffix to the symbolic link filename.