rust: drop adding --enable-new-dtags

--enable-new-dtags is the default since Rust 1.7.0 due to
rust-lang/rust#30378.

Signed-off-by: Doug Goldstein <cardoe@cardoe.com>

recipes-devtools/rust/rust.inc

@@ -124,12 +124,9 @@ TARGET_ENDIAN[i586] = "little"
 TARGET_POINTER_WIDTH[i586] = "32"
 PRE_LINK_ARGS[i586] = "-Wl,--as-needed -m32"
 
-# enable-new-dtags causes rpaths to be inserted as DT_RUNPATH (as well as
-# DT_RPATH), which lets LD_LIBRARY_PATH override them
-RPATH_LDFLAGS = "-Wl,--enable-new-dtags"
-TARGET_PRE_LINK_ARGS = "${RPATH_LDFLAGS} ${TARGET_CC_ARCH} ${TOOLCHAIN_OPTIONS}"
-BUILD_PRE_LINK_ARGS = "${RPATH_LDFLAGS} ${BUILD_CC_ARCH} ${TOOLCHAIN_OPTIONS}"
-HOST_PRE_LINK_ARGS = "${RPATH_LDFLAGS} ${HOST_CC_ARCH} ${TOOLCHAIN_OPTIONS}"
+TARGET_PRE_LINK_ARGS = "${TARGET_CC_ARCH} ${TOOLCHAIN_OPTIONS}"
+BUILD_PRE_LINK_ARGS = "${BUILD_CC_ARCH} ${TOOLCHAIN_OPTIONS}"
+HOST_PRE_LINK_ARGS = "${HOST_CC_ARCH} ${TOOLCHAIN_OPTIONS}"
 
 # These LDFLAGS have '-L' options in them. We need these to come last so they
 # don't screw up the link order and pull in the wrong rust build/version.