Make the version file both a C header file and a Makefile

This allows to -include version instead of -DVERSION=... on CC command line.

GNUmakefile

@@ -75,8 +75,13 @@ all: $(BUILD_PROGRAMS) $(wildcard .gitignore) test.img
 
 ALL_MAKEFILES = $(filter-out config.cache,$(MAKEFILE_LIST)) configure.mk
 
+version: VERSION := $(GEN_VERSION)
 version: $(filter-out version, $(ALL_MAKEFILES)) $(SRC) $(HEADERS) $(wildcard .git/logs/HEAD .git/refs/tags)
-	echo VERSION := $(GEN_VERSION) > $@
+	echo "#if 1" > $@
+	echo "#define VERSION \"$(VERSION)\"" >> $@
+	echo "#else" >> $@
+	echo VERSION := $(VERSION) >> $@
+	echo "#endif" >> $@
 
 $(BUILD_LIBS):
 	ar -r $@ $^

debugvmfs/manifest.mk

@@ -1,3 +1,3 @@
 LDFLAGS := $(DLOPEN_LDFLAGS)
-debugvmfs.o_CFLAGS := -DVERSION=\"$(VERSION)\"
+debugvmfs.o_CFLAGS := -include version
 REQUIRES := libvmfs libreadcmd

fsck.vmfs/manifest.mk

@@ -1,2 +1,2 @@
-vmfs_fsck.o_CFLAGS := -DVERSION=\"$(VERSION)\"
+vmfs_fsck.o_CFLAGS := -include version
 REQUIRES := libvmfs

vmfs-lvm/manifest.mk

@@ -1,3 +1,3 @@
 LDFLAGS := $(DLOPEN_LDFLAGS)
-vmfs-lvm.o_CFLAGS := -DVERSION=\"$(VERSION)\"
+vmfs-lvm.o_CFLAGS := -include version
 REQUIRES := libvmfs libreadcmd