Remove p2p alert handling

src/Makefile.am

@@ -87,7 +87,6 @@ endif
 # bitcoin core #
 BITCOIN_CORE_H = \
   addrman.h \
-  alert.h \
   base58.h \
   bloom.h \
   chain.h \
@@ -176,7 +175,6 @@ libbitcoin_server_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(MINIUPNPC_CP
 libbitcoin_server_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_server_a_SOURCES = \
   addrman.cpp \
-  alert.cpp \
   bloom.cpp \
   chain.cpp \
   checkpoints.cpp \