Build with the system NSPR library instead of the bundled version.

Originally based on this Debian patch:
https://salsa.debian.org/chromium-team/chromium/-/blob/master/debian/patches/system/nspr.patch

diff --git a/base/BUILD.gn b/base/BUILD.gn
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -184,6 +184,12 @@ buildflag_header("ios_cronet_buildflags") {
   flags = [ "CRONET_BUILD=$is_cronet_build" ]
 }
 
+if (is_linux) {
+  ldflags = [
+    "-lnspr4",
+  ]
+}
+
 # Base and everything it depends on should be a static library rather than
 # a source set. Base is more of a "library" in the classic sense in that many
 # small parts of it are used in many different contexts. This combined with a
@@ -838,8 +844,6 @@ mixed_component("base") {
     "third_party/cityhash_v103/src/city_v103.cc",
     "third_party/cityhash_v103/src/city_v103.h",
     "third_party/icu/icu_utf.h",
-    "third_party/nspr/prtime.cc",
-    "third_party/nspr/prtime.h",
     "third_party/superfasthash/superfasthash.c",
     "thread_annotations.h",
     "threading/hang_watcher.cc",
diff --git a/base/time/pr_time_unittest.cc b/base/time/pr_time_unittest.cc
--- a/base/time/pr_time_unittest.cc
+++ b/base/time/pr_time_unittest.cc
@@ -6,7 +6,7 @@
 #include <time.h>
 
 #include "base/compiler_specific.h"
-#include "base/third_party/nspr/prtime.h"
+#include <nspr/prtime.h>
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "testing/gtest/include/gtest/gtest.h"
diff --git a/base/time/time.cc b/base/time/time.cc
--- a/base/time/time.cc
+++ b/base/time/time.cc
@@ -21,7 +21,7 @@
 #include <utility>
 
 #include "base/strings/stringprintf.h"
-#include "base/third_party/nspr/prtime.h"
+#include <nspr/prtime.h>
 #include "base/time/time_override.h"
 #include "build/build_config.h"
 #include "third_party/abseil-cpp/absl/types/optional.h"
tter</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=88f294cc1442ead331f964415bcf9628fcc27968'>root</a>/<a href='/guix/log/tests?id=88f294cc1442ead331f964415bcf9628fcc27968'>tests</a>/<a href='/guix/log/tests/guix-time-machine.sh?id=88f294cc1442ead331f964415bcf9628fcc27968'>guix-time-machine.sh</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/tests/guix-time-machine.sh?id=88f294cc1442ead331f964415bcf9628fcc27968&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-11-05 23:23:23 +0100'>2023-11-05</span></td><td><a href='/guix/commit/tests/guix-time-machine.sh?id=9f05fbb67d0de4d577c21a6fb6888cb6be67cd12'>tests: Make ‘guix time-machine’ test effective.</a><span class='msg-avail'>...<span class='msg-tooltip'>The test as added in 79ec651a286c71a3d4c72be33a1f80e76a560031 had no
effect: first because ‘guix time-machine --commit=X’, not followed by a
command, does nothing, and second because the “! COMMAND” shell stanza
does not have the desired effect (see &lt;https://issues.guix.gnu.org/62406&gt;).

This change rewrites the test to make it effective.

* tests/guix-time-machine.sh: Rewrite.

Change-Id: Ib44a11331c8625e346139a236cffa699cdbd02f2
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-08-16 21:34:13 -0400'>2023-08-16</span></td><td><a href='/guix/commit/tests/guix-time-machine.sh?id=79ec651a286c71a3d4c72be33a1f80e76a560031'>scripts: time-machine: Error when attempting to visit too old commits.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/guix.texi (Invoking guix time-machine): Document limitation.
* guix/inferior.scm (cached-channel-instance): New VALIDATE-CHANNELS
argument.  Use it to validate channels when there are no cache hit.
* guix/scripts/time-machine.scm
(%options): Tag the given reference with 'tag-or-commit instead of 'commit.
(%oldest-possible-commit): New variable.
(guix-time-machine) &lt;validate-guix-channel&gt;: New nested procedure.  Pass it to
the 'cached-channel-instance' call.
* tests/guix-time-machine.sh: New test.
* Makefile.am (SH_TESTS): Register it.

Suggested-by: Simon Tournier &lt;zimon.toutoune@gmail.com&gt;
Reviewed-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
Reviewed-by: Simon Tournier &lt;zimon.toutoune@gmail.com&gt;
</span></span></td><td>Maxim Cournoyer</td></tr>