lang/rust: Update to 1.29.0

Release notes:
* https://blog.rust-lang.org/2018/07/20/Rust-1.27.2.html
* https://blog.rust-lang.org/2018/08/02/Rust-1.28.html
* https://blog.rust-lang.org/2018/09/13/Rust-1.29.html

Up to and including Rust 1.27.x, the Rust build system shelled out to
a configure script to detect the presence and usability of libunwind.
Since Rust 1.28.0, it's using a static result in a `build.rs` file and
expects libunwind to be used. It was not the case on FreeBSD so far, so
we need a patch to this `build.rs` to disable that. We still need to
study if the FreeBSD port should use libunwind and what to do with this
patch. But this problem prevented the update to Rust 1.28.0 already, so
enough delay.

The update also comes with a patch to a few `USE_GECKO`-based ports such
as Firefox [1]. Their configure script has some asumptions on the output
of `rustc --print target-list` which are not true anymore. The patch was
already committed upstream.

The aarch64 version is still marked as BROKEN because I didn't find the
time to work on it. As a consequence, there is also no aarch64 bootstrap
for Rust 1.29.0.

PR:		229826
Approved by:	jbeich [1]
Obtained from:	https://bugzilla.mozilla.org/show_bug.cgi?id=1479540 [1]
Differential Revision:	https://reviews.freebsd.org/D17178

1 files changed, 41 insertions, 0 deletions

diff --git a/www/firefox/files/patch-bug1479540 b/www/firefox/files/patch-bug1479540
new file mode 100644
index 000000000000..e97a94cf8fc0
--- /dev/null
+++ b/www/firefox/files/patch-bug1479540
@@ -0,0 +1,41 @@
+# HG changeset patch
+# User Chris Manchester <cmanchester@mozilla.com>
+# Date 1533063488 25200
+# Node ID 36f4ba2fb6f5139b7942e81554190354da1f369a
+# Parent  ff18e94c90460faa9cca8ff39a0ea4876b0c2039
+Bug 1479540 - Accept "triplet" strings with only two parts in moz.configure. r=froydnj
+
+MozReview-Commit-ID: 7pFhoJgBMhQ
+
+--- build/moz.configure/init.configure
++++ build/moz.configure/init.configure
+@@ -587,17 +587,26 @@ option('--target', nargs=1,
+ @imports(_from='__builtin__', _import='KeyError')
+ @imports(_from='__builtin__', _import='ValueError')
+ def split_triplet(triplet, allow_unknown=False):
+     # The standard triplet is defined as
+     #   CPU_TYPE-MANUFACTURER-OPERATING_SYSTEM
+     # There is also a quartet form:
+     #   CPU_TYPE-MANUFACTURER-KERNEL-OPERATING_SYSTEM
+     # But we can consider the "KERNEL-OPERATING_SYSTEM" as one.
+-    cpu, manufacturer, os = triplet.split('-', 2)
++    # Additionally, some may omit "unknown" when the manufacturer
++    # is not specified and emit
++    #   CPU_TYPE-OPERATING_SYSTEM
++    parts = triplet.split('-', 2)
++    if len(parts) == 3:
++        cpu, _, os = parts
++    elif len(parts) == 2:
++        cpu, os = parts
++    else:
++        die("Unexpected triplet string: %s" % triplet)
+ 
+     # Autoconf uses config.sub to validate and canonicalize those triplets,
+     # but the granularity of its results has never been satisfying to our
+     # use, so we've had our own, different, canonicalization. We've also
+     # historically not been very consistent with how we use the canonicalized
+     # values. Hopefully, this will help us make things better.
+     # The tests are inherited from our decades-old autoconf-based configure,
+     # which can probably be improved/cleaned up because they are based on a
+
+