Upgrade bison from 2.3 to 2.7

See README.android for how the upgrade was done.

Bug: 8517572
Change-Id: I1e42ab59ff385130a7e488371c6058a13add244d
diff --git a/po/POTFILES.in b/po/POTFILES.in
new file mode 100644
index 0000000..ee34879
--- /dev/null
+++ b/po/POTFILES.in
@@ -0,0 +1,33 @@
+src/complain.c
+src/conflicts.c
+src/files.c
+src/getargs.c
+src/gram.c
+src/graphviz.c
+src/location.c
+src/main.c
+src/muscle-tab.c
+src/parse-gram.y
+src/print.c
+src/print_graph.c
+src/reader.c
+src/reduce.c
+src/scan-code.l
+src/scan-gram.l
+src/scan-skel.l
+src/symlist.c
+src/symtab.c
+
+djgpp/subpipe.c
+lib/argmatch.c
+lib/bitset_stats.c
+lib/closeout.c
+lib/error.c
+lib/getopt.c
+lib/obstack.c
+lib/spawn-pipe.c
+lib/quotearg.c
+lib/timevar.c
+lib/w32spawn.h
+lib/wait-process.c
+lib/xalloc-die.c