CI: intel moved the script for ICC

I'm pushing this, though it's a bit useless: ICC seems to dislike our code, for no good reason AFAICT (https://travis-ci.org/github/akimd/bison/jobs/716798713):

../src/symlist.c(75) (col. 3): error #2102: violation of ansi-alias rules
../src/symlist.c(234) (col. 11): error #2102: violation of ansi-alias rules
../src/symlist.c(235) (col. 9): error #2102: violation of ansi-alias rules

When I have time, and if I find how to do it, I'll file a PR to ICC.

commit 3724b50ef951a05afe01ead58adfda6147861c35
Author: Akim Demaille <[email protected]>
Date:   Tue Aug 11 06:34:55 2020 +0200

    CI: intel moved the script for ICC
    
    * .travis.yml: Adjust.

diff --git a/.travis.yml b/.travis.yml
index 853d5488..ed804e02 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -50,6 +50,7 @@ jobs:
         - make -j2 dist-xz
         # Can help understanding why we get "dirty" tarballs.
         - git status
+        - git diff
         - dist=$(echo bison*.xz)
 
         # Unfortunately we cannot deterministically know the name of the tarball without the full
@@ -129,7 +130,7 @@ jobs:
         - CC=icc
         - CXX=icpc
       install:
-        - source /opt/intel/inteloneapi/compiler/latest/env/vars.sh
+        - source /opt/intel/oneapi/compiler/latest/env/vars.sh
       addons:
         apt:
           sources:
diff --git a/lib/.gitignore b/lib/.gitignore
index 58aeac63..37ec5dec 100644
--- a/lib/.gitignore
+++ b/lib/.gitignore
@@ -336,6 +336,7 @@
 /sys_types.in.h
 /sys_wait.in.h
 /sysexits.in.h
+/termios.h
 /termios.in.h
 /textstyle.h
 /textstyle.in.h
diff --git a/m4/.gitignore b/m4/.gitignore
index 8d7a965a..9c84195a 100644
--- a/m4/.gitignore
+++ b/m4/.gitignore
@@ -67,6 +67,7 @@
 /intlmacosx.m4
 /intmax.m4
 /intmax_t.m4
+/inttypes-pri.m4
 /inttypes.m4
 /inttypes_h.m4
 /isnan.m4