build: Remove -I for everything but project root

Remove -I from build system for everything but the project root,
and built-in dependencies.

src/Makefile.am

@@ -18,7 +18,7 @@ else
 LIBUNIVALUE = $(UNIVALUE_LIBS)
 endif
 
-BITCOIN_INCLUDES=-I$(builddir) -I$(builddir)/obj $(BDB_CPPFLAGS) $(BOOST_CPPFLAGS) $(LEVELDB_CPPFLAGS) $(CRYPTO_CFLAGS) $(SSL_CFLAGS)
+BITCOIN_INCLUDES=-I$(builddir) $(BDB_CPPFLAGS) $(BOOST_CPPFLAGS) $(LEVELDB_CPPFLAGS) $(CRYPTO_CFLAGS) $(SSL_CFLAGS)
 
 BITCOIN_INCLUDES += -I$(srcdir)/secp256k1/include
 BITCOIN_INCLUDES += $(UNIVALUE_CFLAGS)

src/Makefile.qt.include

@@ -362,8 +362,7 @@ RES_MOVIES = $(wildcard $(srcdir)/qt/res/movies/spinner-*.png)
 
 BITCOIN_RC = qt/res/bitcoin-qt-res.rc
 
-BITCOIN_QT_INCLUDES = -I$(builddir)/qt -I$(srcdir)/qt -I$(srcdir)/qt/forms \
-  -I$(builddir)/qt/forms -DQT_NO_KEYWORDS
+BITCOIN_QT_INCLUDES = -DQT_NO_KEYWORDS
 
 qt_libbitcoinqt_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(BITCOIN_QT_INCLUDES) \
   $(QT_INCLUDES) $(QT_DBUS_INCLUDES) $(PROTOBUF_CFLAGS) $(QR_CFLAGS)

src/Makefile.test.include

@@ -96,7 +96,7 @@ BITCOIN_TESTS += \
 endif
 
 test_test_bitcoin_SOURCES = $(BITCOIN_TESTS) $(JSON_TEST_FILES) $(RAW_TEST_FILES)
-test_test_bitcoin_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) -I$(builddir)/test/ $(TESTDEFS) $(EVENT_CFLAGS)
+test_test_bitcoin_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(TESTDEFS) $(EVENT_CFLAGS)
 test_test_bitcoin_LDADD =
 if ENABLE_WALLET
 test_test_bitcoin_LDADD += $(LIBBITCOIN_WALLET)