fix makefiles and init.cpp after chainparams merge

- add missing chainparams.o to some makefiles
- remove a double-include of chainparams.h in init.cpp

src/makefile.linux-mingw

@@ -93,7 +93,8 @@ OBJS= \
     obj/hash.o \
     obj/bloom.o \
     obj/leveldb.o \
-    obj/txdb.o
+    obj/txdb.o \
+    obj/chainparams.o
 
 all: bitcoind.exe