[build] Add support for local configuration files

Include config/local/$file in config/$file where it makes sense and
create empty local configs during build if not present.

Modified-by: Michael Brown <mcb30@etherboot.org>
Signed-off-by: Michael Brown <mcb30@etherboot.org>

src/.gitignore

 .echocheck
 TAGS*
 bin*
-config-local.h

src/Makefile.housekeeping

 	@$(RM) $(2)
 	@$(TOUCH) $(2)
 	@$(CPP) $(CFLAGS) $(CFLAGS_$(3)) $(CFLAGS_$(4)) -DOBJECT=$(4) \
-		-Wno-error -MM $(1) -MG -MP | \
+		-Wno-error -M $(1) -MG -MP | \
 		sed 's/\.o\s*:/_DEPS =/' >> $(2)
 	@$(ECHO_E) '\n$$(BIN)/$(4).o :' \
 		 '$(1) $$(MAKEDEPS) $$(POST_O_DEPS) $$($(4)_DEPS)' \
 	$(Q)$(HOST_CC) -idirafter include -O2 -o $@ $<
 CLEANUP += $(ICCFIX)
 
+###############################################################################
+#
+# Local configs
+#
+config/local/%.h :
+	$(Q)touch $@
+
 ###############################################################################
 #
 # Auto-incrementing build serial number.  Append "bs" to your list of

src/config/console.h

 //#define	CONSOLE_BTEXT		/* Who knows what this does? */
 //#define	CONSOLE_PC_KBD		/* Direct access to PC keyboard */
 
+#include <config/local/console.h>
+
 #endif /* CONFIG_CONSOLE_H */

src/config/general.h

 #undef	GDBUDP			/* Remote GDB debugging over UDP
 				 * (both may be set) */
 
+#include <config/local/general.h>
+
 #endif /* CONFIG_GENERAL_H */

src/config/ioapi.h

 //#undef	PCIAPI_PCBIOS		/* Access via PCI BIOS */
 //#define	PCIAPI_DIRECT		/* Direct access via Type 1 accesses */
 
+#include <config/local/ioapi.h>
+
 #endif /* CONFIG_IOAPI_H */

src/config/isa.h

 #undef	ISA_PROBE_ADDRS		/* e.g. 0x200, 0x300 */
 #undef	ISA_PROBE_ONLY		/* Do not probe any other addresses */
 
+#include <config/local/isa.h>
+
 #endif /* CONFIG_ISA_H */

src/config/local/.gitignore

+*

src/config/nap.h

 //#undef		NAP_PCBIOS
 //#define		NAP_NULL
 
+#include <config/local/nap.h>
+
 #endif /* CONFIG_NAP_H */

src/config/serial.h

 #define	COMSTOP		1		/* Stop bits */
 #endif
 
+#include <config/local/serial.h>
+
 #endif /* CONFIG_SERIAL_H */

src/config/timer.h

 //#undef		TIMER_PCBIOS
 //#define		TIMER_RDTSC
 
+#include <config/local/timer.h>
+
 #endif /* CONFIG_TIMER_H */

src/config/umalloc.h

 
 #include <config/defaults.h>
 
+#include <config/local/umalloc.h>
+
 #endif /* CONFIG_UMALLOC_H */