Use RUNPATH instead of RPATH so that end users can override the library
search path (and the 'validate-runpath' phase can do its work).

diff --git a/build/config/gcc/BUILD.gn b/build/config/gcc/BUILD.gn
--- a/build/config/gcc/BUILD.gn
+++ b/build/config/gcc/BUILD.gn
@@ -99,7 +99,14 @@ config("executable_config") {
     ]
   }
 
-  if (!is_android && current_os != "aix") {
+  if (is_linux) {
+    ldflags += [
+      # Set DT_RUNPATH instead of DT_RPATH which is important because the
+      # former can be overridden at runtime, and Guix has support for
+      # verifying that nothing is missing.
+      "-Wl,--enable-new-dtags",
+    ]
+  } else if (!is_android && current_os != "aix") {
     ldflags += [
       # TODO(GYP): Do we need a check on the binutils version here?
       #
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<div class='path'>path: <a href='/guix/log/?id=d827fd31ca19b2f81252cbe4e8bc982dd453a49a'>root</a>/<a href='/guix/log/build-aux?id=d827fd31ca19b2f81252cbe4e8bc982dd453a49a'>build-aux</a>/<a href='/guix/log/build-aux/check-final-inputs-self-contained.scm?id=d827fd31ca19b2f81252cbe4e8bc982dd453a49a'>check-final-inputs-self-contained.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/build-aux/check-final-inputs-self-contained.scm?id=d827fd31ca19b2f81252cbe4e8bc982dd453a49a&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-03-25 00:26:13 +0100'>2018-03-25</span></td><td><a href='/guix/commit/build-aux/check-final-inputs-self-contained.scm?id=4debffadb7e166e34fb2ef00e75c4b73977ede15'>maint: Adjust 'check-final-inputs-self-contained' for glibc:static.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>