libdnet: update to compile with glibc 2.38

strlcat and strlcpy have been added to glibc 2.38.
update the defines to use the glibc versions, and not conflict with
string.h.

ref:
- https://sourceware.org/git/?p=glibc.git;a=commit;h=454a20c8756c9c1d55419153255fc7692b3d2199

packages/network/libdnet/package.mk

@@ -13,9 +13,7 @@ PKG_LONGDESC="A simplified, portable interface to several low-level networking r
 PKG_TOOLCHAIN="autotools"
 PKG_BUILD_FLAGS="+pic"
 
-PKG_CONFIGURE_OPTS_TARGET="ac_cv_func_strlcat=no \
-                           ac_cv_func_strlcpy=no \
-                           --enable-static \
+PKG_CONFIGURE_OPTS_TARGET="--enable-static \
                            --disable-shared \
                            --disable-python"