mail/thunderbird: unbreak with RUST=on

env CARGO_TARGET_DIR=. RUSTC=/usr/local/bin/rustc /usr/local/bin/cargo build --release --frozen --manifest-path /wrkdirs/usr/ports/mail/thunderbird/work/thunderbird-52.3.0/mozilla/toolkit/library/gtest/rust/Cargo.toml --target=x86_64-unknown-freebsd --verbose --
error: failed to load source for a dependency on `mp4parse_capi`

Caused by:
  Unable to update file:///wrkdirs/usr/ports/mail/thunderbird/work/thunderbird-52.3.0/mozilla/media/libstagefright/binding/mp4parse_capi

Caused by:
  failed to parse manifest at `/wrkdirs/usr/ports/mail/thunderbird/work/thunderbird-52.3.0/mozilla/media/libstagefright/binding/mp4parse_capi/Cargo.toml`

Caused by:
  could not parse input as TOML

Caused by:
  duplicate key: `build` for key `package`

cf. https://hg.mozilla.org/releases/mozilla-esr52/shortlog/THUNDERBIRD_52_VERBRANCH

Reported by:	YuryG @ forums.freebsd.org

1 files changed, 0 insertions, 66 deletions

diff --git a/mail/thunderbird/files/patch-bug1338655 b/mail/thunderbird/files/patch-bug1338655
deleted file mode 100644
index 2471ca987e12..000000000000
--- a/mail/thunderbird/files/patch-bug1338655
+++ /dev/null
@@ -1,66 +0,0 @@
-commit bbd48a5613c8
-Author: Ralph Giles <giles@mozilla.com>
-Date:   Fri Feb 10 12:58:18 2017 -0800
-
-    Bug 1338655 - Don't try to build mp4parse bindings. r=froydnj
-    
-    We use the cheddar crate to generate a C header file
-    for our mp4parse_capi wrapper crate. Currently we
-    do this at code check-in time via update-rust.sh.
-    
-    Cargo 0.18 and later will try to execute a build.rs
-    file in the crate source tree regardless of whether
-    it's specified in Cargo.toml so patching out that
-    line just results in 'crate cheddar not found'.
-    
-    This change restores the old behaviour by substituting
-    a 'build = false' line instead.
-    
-    We do have syntex vendored, but we don't currently build
-    it by default, so I prefer this solution to just vendoring
-    cheddar and generating the header at build time. The syntex
-    crate is quite large and adds significantly to our compile
-    time.
-    
-    MozReview-Commit-ID: InJRRODWAdP
-    
-    --HG--
-    extra : rebase_source : 29378fcbc86015ce6cc22dc66d38a43ddbac204e
----
- media/libstagefright/binding/mp4parse-cargo.patch     | 5 +++--
- media/libstagefright/binding/mp4parse_capi/Cargo.toml | 2 ++
- 2 files changed, 5 insertions(+), 2 deletions(-)
-
-diff --git media/libstagefright/binding/mp4parse-cargo.patch media/libstagefright/binding/mp4parse-cargo.patch
-index 1dd13d20472a..bfa0ab74b424 100644
---- mozilla/media/libstagefright/binding/mp4parse-cargo.patch
-+++ mozilla/media/libstagefright/binding/mp4parse-cargo.patch
-@@ -25,12 +25,13 @@ diff --git a/media/libstagefright/binding/mp4parse_cap
- index aeeebc65..5c0836a 100644
- --- a/media/libstagefright/binding/mp4parse_capi/Cargo.toml
- +++ b/media/libstagefright/binding/mp4parse_capi/Cargo.toml
--@@ -18,17 +18,9 @@ exclude = [
-+@@ -18,17 +18,11 @@ exclude = [
-    "*.mp4",
-  ]
-  
- -build = "build.rs"
---
-++build = false
-+ 
-  [dependencies]
-  "mp4parse" = {version = "0.6.0", path = "../mp4parse"}
-  
-diff --git media/libstagefright/binding/mp4parse_capi/Cargo.toml media/libstagefright/binding/mp4parse_capi/Cargo.toml
-index aee7ee947151..d7e3f55119d3 100644
---- mozilla/media/libstagefright/binding/mp4parse_capi/Cargo.toml
-+++ mozilla/media/libstagefright/binding/mp4parse_capi/Cargo.toml
-@@ -18,6 +18,8 @@ exclude = [
-   "*.mp4",
- ]
- 
-+build = false
-+
- [dependencies]
- byteorder = "1.0.0"
- "mp4parse" = {version = "0.6.0", path = "../mp4parse"}