build: Unbreak out of tree builds

.gitignore

@@ -31,7 +31,7 @@
 /config.log
 /autom4te.cache
 /GNUmakefile
-/common/config.h
+/config.h
 /common-bios
 /common-uefi32
 /common-uefi64

GNUmakefile.in

@@ -197,7 +197,7 @@ dist:
 
 .PHONY: distclean
 distclean: clean
-	rm -rf toolchain ovmf* config.log config.status GNUmakefile common/config.h
+	rm -rf toolchain ovmf* config.log config.status GNUmakefile config.h
 
 .PHONY: maintainer-clean
 maintainer-clean: distclean

common/GNUmakefile

@@ -63,6 +63,7 @@ override INTERNAL_CFLAGS := \
 	-DCOM_OUTPUT=$(COM_OUTPUT) \
 	-DE9_OUTPUT=$(E9_OUTPUT) \
 	-I../freestanding_headers \
+	-I'$(call SHESCAPE,$(BUILDDIR))/..' \
 	-I. \
 	-I../stivale \
 	-I'$(call SHESCAPE,$(BUILDDIR))/tinf'

configure.ac

@@ -237,5 +237,5 @@ AC_SUBST(LIMINE_COPYRIGHT, [$LIMINE_COPYRIGHT])
 
 AC_PREFIX_DEFAULT(/usr/local)
 
-AC_CONFIG_FILES(GNUmakefile common/config.h)
+AC_CONFIG_FILES(GNUmakefile config.h)
 AC_OUTPUT