[#3550] AC_PROG_LN_S and ChangeLog entry

Author: andrei-pavel

ChangeLog

@@ -1,3 +1,6 @@
+2277.	[build]		andrei
+	"libca_rbac.so" is now a symbolic link to "libdhcp_rbac.so".
+
 2276.	[build]		razvan
 	The library version numbers have been bumped up for the Kea 2.7.2
 	development release.

configure.ac

@@ -42,6 +42,9 @@ AC_PROG_CXX
 # Check for preprocessors.
 AC_PROG_CXXCPP
 
+# Check for ln -s.
+AC_PROG_LN_S
+
 # Check for exact Kea version.
 AC_MSG_CHECKING(whether this is a tarball or git source or package preparation)
 # KEA_PKG_VERSION_IN_CONFIGURE and KEA_PKG_TYPE_IN_CONFIGURE names may be weird