Remove check for getaddrinfo_a() which is glibc-specific and not used
anywhere in the codebase. This fuction was incorporated into glibc >=
2.34 (released 2021-08-01) [1], so even on systems that use glibc,
this check is moot.

[1] https://sourceware.org/git/?p=glibc.git;a=commit;h=2ace57217028da99fc98f79ae0a625a1ec842724

--- configure.orig	2026-01-16 20:31:09 UTC
+++ configure
@@ -13887,18 +13887,6 @@ fi
 fi
 
 
-ANL_LIBS=""
-OLD_LIBS=$LIBS
-LIBS="$LIBS -lanl"
-ac_fn_c_check_func "$LINENO" "getaddrinfo_a" "ac_cv_func_getaddrinfo_a"
-if test "x$ac_cv_func_getaddrinfo_a" = xyes
-then :
-  LIBGAVL_LIBS="${LIBGAVL_LIBS} -lanl"
-else $as_nop
-  as_fn_error $? "\"getaddrinfo_a not found in libanl\"" "$LINENO" 5
-fi
-
-LIBS=$OLD_LIBS