icoutils: fix build with Ventura (at least)

the linker does not appear to accept one static archive
being wholly embedded into another.

in this case, embedding libgnu.a into libcommon.a was
unnecessary anyway, as the two libraries are always included
individually when linked in.

closes: https://trac.macports.org/ticket/66084

graphics/icoutils/Portfile

@@ -33,6 +33,9 @@ use_bzip2           yes
 
 patchfiles          patch-lib-error.c.diff
 
+# https://trac.macports.org/ticket/66084
+patchfiles-append   patch-icoutils-remove-libgnu-from-libcommon.diff
+
 depends_lib         port:libpng
 depends_run         port:perl${perl5.major} \
                     port:p${perl5.major}-libwww-perl

graphics/icoutils/files/patch-icoutils-remove-libgnu-from-libcommon.diff

@@ -0,0 +1,20 @@
+--- common/Makefile.in.orig	2022-10-27 20:27:42
++++ common/Makefile.in	2022-10-27 20:29:00
+@@ -154,7 +154,6 @@
+ am__v_AR_0 = @echo "  AR      " $@;
+ am__v_AR_1 = 
+ libcommon_a_AR = $(AR) $(ARFLAGS)
+-libcommon_a_DEPENDENCIES = ../lib/libgnu.a
+ am_libcommon_a_OBJECTS = error.$(OBJEXT) hmap.$(OBJEXT) \
+ 	io-utils.$(OBJEXT) intutil.$(OBJEXT) llist.$(OBJEXT) \
+ 	strbuf.$(OBJEXT) string-utils.$(OBJEXT) tmap.$(OBJEXT)
+@@ -1023,9 +1022,6 @@
+ 	string-utils.h \
+ 	tmap.c \
+ 	tmap.h
+-
+-libcommon_a_LIBADD = \
+-	../lib/libgnu.a
+
+ AM_CPPFLAGS = \
+ 	-I$(top_builddir)/lib \