Bug 1616195 - Improve the Linux distribution version information included in crash reports r=KrisWright

We previously only included the contents of the /etc/lsb-release file, however
this file is not present in RedHat-based distributions which use
/etc/os-release instead. This patch will read the latter if the former is not
present.

Differential Revision: https://phabricator.services.mozilla.com/D68986

--HG--
extra : moz-landing-system : lando

toolkit/crashreporter/breakpad-client/linux/minidump_writer/minidump_writer.cc

@@ -278,8 +278,10 @@ class MinidumpWriter {
     dir.CopyIndex(dir_index++, &dirent);
 
     dirent.stream_type = MD_LINUX_LSB_RELEASE;
-    if (!WriteFile(&dirent.location, "/etc/lsb-release"))
+    if (!WriteFile(&dirent.location, "/etc/lsb-release") &&
+        !WriteFile(&dirent.location, "/etc/os-release")) {
       NullifyDirectoryEntry(&dirent);
+    }
     dir.CopyIndex(dir_index++, &dirent);
 
     dirent.stream_type = MD_LINUX_CMD_LINE;