Disable the build/use of libssp/gets-chk since FreeBSD 12 and later
do not feature gets() any longer.

--- UTC
Index: libssp/Makefile.am
===================================================================
--- libssp/Makefile.am	(revision 263319)
+++ libssp/Makefile.am	(working copy)
@@ -42,7 +42,7 @@
 nobase_libsubinclude_HEADERS = ssp/ssp.h ssp/string.h ssp/stdio.h ssp/unistd.h
 
 libssp_la_SOURCES = \
-	ssp.c gets-chk.c memcpy-chk.c memmove-chk.c mempcpy-chk.c \
+	ssp.c memcpy-chk.c memmove-chk.c mempcpy-chk.c \
 	memset-chk.c snprintf-chk.c sprintf-chk.c stpcpy-chk.c \
 	strcat-chk.c strcpy-chk.c strncat-chk.c strncpy-chk.c \
 	vsnprintf-chk.c vsprintf-chk.c
Index: libssp/Makefile.in
===================================================================
--- libssp/Makefile.in	(revision 263319)
+++ libssp/Makefile.in	(working copy)
@@ -108,7 +108,7 @@
 am__installdirs = "$(DESTDIR)$(toolexeclibdir)" \
 	"$(DESTDIR)$(libsubincludedir)"
 LTLIBRARIES = $(toolexeclib_LTLIBRARIES)
-am_libssp_la_OBJECTS = ssp.lo gets-chk.lo memcpy-chk.lo memmove-chk.lo \
+am_libssp_la_OBJECTS = ssp.lo memcpy-chk.lo memmove-chk.lo \
 	mempcpy-chk.lo memset-chk.lo snprintf-chk.lo sprintf-chk.lo \
 	stpcpy-chk.lo strcat-chk.lo strcpy-chk.lo strncat-chk.lo \
 	strncpy-chk.lo vsnprintf-chk.lo vsprintf-chk.lo
@@ -291,7 +291,7 @@
 libsubincludedir = $(libdir)/gcc/$(target_noncanonical)/$(gcc_version)/include
 nobase_libsubinclude_HEADERS = ssp/ssp.h ssp/string.h ssp/stdio.h ssp/unistd.h
 libssp_la_SOURCES = \
-	ssp.c gets-chk.c memcpy-chk.c memmove-chk.c mempcpy-chk.c \
+	ssp.c memcpy-chk.c memmove-chk.c mempcpy-chk.c \
 	memset-chk.c snprintf-chk.c sprintf-chk.c stpcpy-chk.c \
 	strcat-chk.c strcpy-chk.c strncat-chk.c strncpy-chk.c \
 	vsnprintf-chk.c vsprintf-chk.c
@@ -452,7 +452,6 @@
 distclean-compile:
 	-rm -f *.tab.c
 
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gets-chk.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libssp_nonshared_la-ssp-local.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/memcpy-chk.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/memmove-chk.Plo@am__quote@