build: provide -version-info directly instead of -version-number

The info components carry the real OS-independent library version
information, from which the version number is computed differently
on different systems. According to the libtool manual "new projects
should use the -version-info flag instead".

Signed-off-by: Ferenc Wágner <wferi@debian.org>

libknet/Makefile.am

@@ -17,6 +17,7 @@ EXTRA_DIST		= $(SYMFILE)
 
 SUBDIRS			= . tests
 
+# https://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
 libversion		= 1:0:0
 
 # override global LIBS that pulls in lots of craft we don't need here
@@ -86,7 +87,7 @@ EXTRA_libknet_la_DEPENDENCIES	= $(SYMFILE)
 libknet_la_LDFLAGS	= $(AM_LDFLAGS) \
 			  -Wl,--version-script=$(srcdir)/$(SYMFILE) \
 			  -Wl,-rpath=$(pkglibdir) \
-			  -version-number $(libversion)
+			  -version-info $(libversion)
 
 libknet_la_LIBADD	= $(PTHREAD_LIBS) $(dl_LIBS) $(rt_LIBS) $(m_LIBS)
 

libtap/Makefile.am

@@ -38,7 +38,7 @@ EXTRA_libtap_la_DEPENDENCIES	= $(SYMFILE)
 
 libtap_la_LDFLAGS	= $(AM_LDFLAGS) \
 			  -Wl,-version-script,$(srcdir)/$(SYMFILE) \
-			  -version-number $(libversion)
+			  -version-info $(libversion)
 
 TESTS			= $(check_PROGRAMS)