java/eclipse: Fix build: ld: error: unable to find library -lGLU

[INFO] [exec] cc -shared -fPIC -L`pkg-config --variable=prefix gtk+-3.0`/lib -s -o libswt-glx-gtk-4966r5.so swt.o glx.o glx_structs.o glx_stats.o -lGL -lGLU -lm
[INFO] [exec] gmake[1]: Leaving directory '/wrkdirs/usr/ports/java/eclipse/work/eclipse.platform.releng.aggregator-R4_33_maintenance/eclipse.platform.swt/binaries/org.eclipse.swt.gtk.freebsd.x86_64/target/natives-build-temp'
[INFO] [exec] * GTK3 Build failed, aborting further actions..
[INFO] [exec] ld: error: unable to find library -lGLU
[INFO] [exec] cc: error: linker command failed with exit code 1 (use -v to see invocation)
[INFO] [exec] gmake[1]: * [make_unix.mak:245: libswt-glx-gtk-4966r5.so] Error 1

PR: 282382
Approved by: Norbert Grundmann <ngrundmann@gmx.de> (maintainer)
MFH: 2024Q4

(cherry picked from commit 58566c547fc5d0c69277fc5b1049697a644c0b36)