build: Let the depends build system define a path to dsymutil tool

depends/Makefile

@@ -224,6 +224,7 @@ $(host_prefix)/share/config.site : config.site.in $(host_prefix)/.stamp_$(final_
             -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)|' \
             -e 's|@CFLAGS@|$(strip $(host_CFLAGS) $(host_$(release_type)_CFLAGS))|' \