debian/control: Fix build-dependency on openssl to work with new versions...

The new versions have Multi-Arch: allowed, and surprisingly dpkg doesn't
consider them to satisfy a dependency on openssl:native.  Change the
build-dependency into an alternative satisfiable by both old and new
versions. (Closes: #839145)

(cherry picked from commit 8e552ff10c)

debian/changelog

@@ -6,6 +6,8 @@ linux (4.9~rc3-1~exp1) UNRELEASED; urgency=medium
   * [rt] Disable until it is updated for 4.9 or later
   * kbuild: add -fno-PIE (Closes: #841368)
   * Compile with gcc-6 on all architectures
+  * debian/control: Fix build-dependency on openssl to work with new
+    versions that have M-A: allowed (Closes: #839145)
 
  -- Ben Hutchings <ben@decadent.org.uk>  Sat, 29 Oct 2016 00:08:55 +0100
 

debian/templates/control.source.in

@@ -20,9 +20,11 @@ Build-Depends:
 # used by upstream to build include/generated/timeconst.h
  bc <!stage1>,
 # used by upstream to build signing tools and to process certificates
-# (the arch-qualification is a workaround for #827628 and #827633)
+# - libssl-dev arch-qualification is a workaround for #827628 and #827633
  libssl-dev:native <!stage1>, libssl-dev [linux-any] <!stage1 !pkg.linux.notools cross>,
- openssl:native <!stage1>,
+# - openssl needs to run on the host; need :native for older versions that do
+#   not have M-A: allowed but need unqualified name for newer versions
+ openssl (>= 1.1.0-1~) <!stage1> | openssl:native <!stage1>,
 # used by upstream to build perf documentation
  asciidoc <!stage1 !nodoc !pkg.linux.notools>,
  xmlto <!stage1 !nodoc !pkg.linux.notools>,