Move print_version into printversion.{h|c}

Rename version.c so that the implementation is called after the header
and the header doesn't clash with the toplevel version.h. print_version
depends on argp and is only used in the tools.

Signed-off-by: Ulf Hermann <ulf.hermann@qt.io>
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 3e0c601..7a65eb9 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -35,10 +35,10 @@
 
 libeu_a_SOURCES = xstrdup.c xstrndup.c xmalloc.c next_prime.c \
 		  crc32.c crc32_file.c md5.c sha1.c \
-		  color.c version.c
+		  color.c printversion.c
 
 noinst_HEADERS = fixedsizehash.h libeu.h system.h dynamicsizehash.h list.h \
-		 md5.h sha1.h eu-config.h color.h
+		 md5.h sha1.h eu-config.h color.h printversion.h
 EXTRA_DIST = dynamicsizehash.c
 
 if !GPROF