ci: Switch from Travis to AppVeyor

Since June 15th, 2021, the building on travis-ci.org is ceased. Hence switch
to AppVeyor.

.appveyor.yml

@@ -0,0 +1,15 @@
+image:
+  - Ubuntu
+  - Ubuntu1604
+  - Ubuntu2004
+  - macos
+  - macos-mojave
+  # - Visual Studio 2019
+
+clone_depth: 5
+
+install:
+  - sh: 'ci/install.sh'
+
+build_script:
+  - sh: 'ci/build.sh'

.travis.yml

@@ -1,26 +0,0 @@
-language: c
-
-os:
-  - linux
-  - osx
-
-dist: focal # 20.04
-
-arch:
-  - amd64
-  - ppc64le
-
-addons:
-  apt:
-    packages:
-      - dpkg
-      - gcc
-      - libcunit1-dev
-      - libibverbs-dev
-      - librdmacm-dev
-      - make
-      - pkg-config
-      - xsltproc
-
-script:
-  ci/build.sh

ci/install.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+case "$(uname)" in
+    Linux)
+	packages=(
+	    libcunit1-dev
+	    libgcrypt20-dev
+	    librdmacm-dev
+	    xsltproc
+	)
+	for p in "${packages[@]}"; do
+	    sudo sh -c "apt-get install -y $p"
+	done
+	;;
+    Darwin)
+	;;
+esac