build: don't use install_name_tool for macOS deploy when cross-compiling

This is only needed when compiling on macOS. This means we can also
better scope the usage of `-headerpad_max_install_names`.

depends/Makefile

@@ -234,7 +234,6 @@ $(host_prefix)/share/config.site : config.site.in $(host_prefix)/.stamp_$(final_
             -e 's|@NM@|$(host_NM)|' \
             -e 's|@STRIP@|$(host_STRIP)|' \
             -e 's|@OTOOL@|$(host_OTOOL)|' \
-            -e 's|@INSTALL_NAME_TOOL@|$(host_INSTALL_NAME_TOOL)|' \
             -e 's|@DSYMUTIL@|$(host_DSYMUTIL)|' \
             -e 's|@build_os@|$(build_os)|' \
             -e 's|@host_os@|$(host_os)|' \