starter: Add new bison/flex based parser for ipsec.conf

The parser simply returns key/value pairs of all sections, it already
resolves also= and allows overriding options in all included sections
(not only %default), options set in included section can also be cleared
again (key=).
It provides other improvements too, like quoted strings (with escape
sequences), unlimited includes and better whitespace/comment handling.

src/starter/Android.mk

@@ -3,11 +3,12 @@ include $(CLEAR_VARS)
 
 # copy-n-paste from Makefile.am (update for LEX/YACC)
 starter_SOURCES := \
-parser.c lexer.c ipsec-parser.h netkey.c args.h netkey.h \
-starterstroke.c confread.c \
-starterstroke.h confread.h args.c \
-keywords.c files.h keywords.h cmp.c starter.c cmp.h invokecharon.c \
-invokecharon.h klips.c klips.h
+starter.c files.h \
+parser/parser.c parser/lexer.c parser/conf_parser.c parser/conf_parser.h \
+parser.c lexer.c ipsec-parser.h args.c args.h \
+confread.c confread.h keywords.c keywords.h cmp.c cmp.h \
+invokecharon.c invokecharon.h starterstroke.c starterstroke.h \
+netkey.c netkey.h klips.c klips.h
 
 LOCAL_SRC_FILES := $(filter %.c,$(starter_SOURCES))
 
@@ -16,6 +17,7 @@ LOCAL_SRC_FILES := $(filter %.c,$(starter_SOURCES))
 LOCAL_C_INCLUDES += \
 	$(strongswan_PATH)/src/libhydra \
 	$(strongswan_PATH)/src/libstrongswan \
+	$(strongswan_PATH)/src/starter \
 	$(strongswan_PATH)/src/stroke
 
 LOCAL_CFLAGS := $(strongswan_CFLAGS) -DSTART_CHARON \