thunderbird: Update version from 60.8.0 to 68.0

https://www.thunderbird.net/en-US/thunderbird/68.0/releasenotes/

thunderbird.be0

@@ -2,17 +2,12 @@
 
 #export BEE_TMP_TMPDIR=/dev/shm BEE_TMP_BUILDROOT=/dev/shm/bee-root BEE_MAKEFLAGS='-j80'
 
-# BEE_VERSION thunderbird-60.8.0-1
+# BEE_VERSION thunderbird-68.0-0
 
 SRCURL[0]="https://ftp.mozilla.org/pub/thunderbird/releases/${PKGVERSION}/source/thunderbird-${PKGVERSION}.source.tar.xz"
 
 # build_in_sourcedir
 
-mee_patch() {
-    start_cmd sed -i -e '/#!\[deny(missing_docs)\]/d' ${S}/servo/components/style/lib.rs
-    start_cmd sed -i -e 's/#!\[deny(unsafe_code, missing_docs)\]/#!\[deny(unsafe_code)\]/g' ${S}/servo/components/style_traits/lib.rs
-}
-
 mee_configure() {
     . /pkg/rustc-1.34.2-0/profile