objtool: Fix build by linking against tools/lib/ctype.o sources

Fix objtool build, because it adds _ctype dependency via isspace call patch.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: André Goddard Rosa <andre.goddard@gmail.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 7bd330de ("tools lib: Adopt skip_spaces() from the kernel sources")
Link: http://lkml.kernel.org/r/20190702121240.GB12694@kravaSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/objtool/Build

@@ -9,6 +9,7 @@ objtool-y += special.o
 objtool-y += objtool.o
 
 objtool-y += libstring.o
+objtool-y += libctype.o
 objtool-y += str_error_r.o
 
 CFLAGS += -I$(srctree)/tools/lib
@@ -17,6 +18,10 @@ $(OUTPUT)libstring.o: ../lib/string.c FORCE
 	$(call rule_mkdir)
 	$(call if_changed_dep,cc_o_c)
 
+$(OUTPUT)libctype.o: ../lib/ctype.c FORCE
+	$(call rule_mkdir)
+	$(call if_changed_dep,cc_o_c)
+
 $(OUTPUT)str_error_r.o: ../lib/str_error_r.c FORCE
 	$(call rule_mkdir)
 	$(call if_changed_dep,cc_o_c)