BSD.usr.dist: remove empty /usr/libdata/gcc directory

I am unsure of its exact historical usage, but, we no longer ship GCC
with FreeBSD, and it should have been removed.

Reviewed by:	imp, emaste
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D44440

ObsoleteFiles.inc

@@ -51,6 +51,9 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20240321: remove empty /usr/libdata/gcc directory
+OLD_DIRS+=usr/libdata/gcc
+
 # 20240307: Improperly installed awk tests removed
 OLD_FILES+=usr/tests/usr.bin/awk/bugs-fixed/missing-precision.ok
 OLD_FILES+=usr/tests/usr.bin/awk/bugs-fixed/negative-nf.ok

etc/mtree/BSD.usr.dist

@@ -85,8 +85,6 @@
         ..
     ..
     libdata
-        gcc
-        ..
         ldscripts
         ..
         pkgconfig

share/man/man7/hier.7

@@ -28,7 +28,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd February 27, 2024
+.Dd March 21, 2024
 .Dt HIER 7
 .Os
 .Sh NAME
@@ -406,8 +406,6 @@ shared libraries for internationalization
 miscellaneous utility data files
 .Pp
 .Bl -tag -width Fl -compact
-.It Pa gcc/
-GCC configuration data
 .It Pa ldscripts/
 linker scripts; see
 .Xr ld 1