Don't add the libdir to the search path or bake the libdir as a runpath when
doing a native build because we always install to a standard location.

Bug: https://bugs.gentoo.org/385775

diff -Naur a/apr-config.in b/apr-config.in
--- a/apr-config.in	2023-03-13 10:29:04.000000000 +0000
+++ b/apr-config.in	2024-05-14 10:23:28.429984195 +0100
@@ -233,7 +233,7 @@
         ### avoid using -L if libdir is a "standard" location like /usr/lib
         # Since the user is specifying they are linking with libtool, we
         # *know* that -R will be recognized by libtool.
-        flags="$flags -L$libdir -R$libdir -l${APR_LIBNAME}"
+        flags="$flags -l${APR_LIBNAME}"
     elif test "$location" = "crosscompile"; then
         flags="$flags  -L${APR_TARGET_DIR}/$libdir  -l${APR_LIBNAME}"
     else