xen: rewrite build expression to be more modular, support upstream qe…

…mu and seabios

Also:

* provides a bunch of build options
* documents build options config in longDescription
* provides a bunch of predefined packages and documents them some more
* sources' hashes stay the same

pkgs/applications/virtualization/xen/0000-fix-install-python.patch

@@ -0,0 +1,16 @@
+tools/python/install-wrap script brakes shebangs patching, disable
+
+diff --git a/tools/Rules.mk b/tools/Rules.mk
+index 87a56dc..a7da869 100644
+--- a/tools/Rules.mk
++++ b/tools/Rules.mk
+@@ -90,8 +90,7 @@ CFLAGS += $(CFLAGS-y)
+
+ CFLAGS += $(EXTRA_CFLAGS_XEN_TOOLS)
+
+-INSTALL_PYTHON_PROG = \
+-	$(XEN_ROOT)/tools/python/install-wrap "$(PYTHON_PATH)" $(INSTALL_PROG)
++INSTALL_PYTHON_PROG = $(INSTALL_PROG)
+
+ %.opic: %.c
+ 	$(CC) $(CPPFLAGS) -DPIC $(CFLAGS) $(CFLAGS_$*.opic) -fPIC -c -o $@ $< $(APPEND_CFLAGS)

pkgs/applications/virtualization/xen/0000-fix-ipxe-src.patch

@@ -0,0 +1,27 @@
+hack to make etherboot use prefetched ipxe
+
+diff --git a/tools/firmware/etherboot/Makefile b/tools/firmware/etherboot/Makefile
+index a0578d2..64428a0 100644
+--- a/tools/firmware/etherboot/Makefile
++++ b/tools/firmware/etherboot/Makefile
+@@ -16,6 +16,7 @@ IPXE_TARBALL_URL ?= $(XEN_EXTFILES_URL)/ipxe-git-$(IPXE_GIT_TAG).tar.gz
+
+ D=ipxe
+ T=ipxe.tar.gz
++G=ipxe.git
+
+ ROMS = $(addprefix $D/src/bin/, $(addsuffix .rom, $(ETHERBOOT_NICS)))
+
+@@ -36,9 +37,9 @@ $T:
+ 	fi
+ 	mv _$T $T
+
+-$D/src/arch/i386/Makefile: $T Config
+-	rm -rf $D
+-	gzip -dc $T | tar xf -
++$D/src/arch/i386/Makefile: $G Config
++	mkdir $D
++	cp -a $G/* $D
+ 	for i in $$(cat patches/series) ; do                 \
+ 	    patch -d $D -p1 --quiet <patches/$$i || exit 1 ; \
+ 	done