subprojects: add libpcap with plugin loader support

Add libpcap as a meson wrap subproject with three patches on top of
upstream commit bac2884b. These patches implement the plugin loader
proposed in the-tcpdump-group/libpcap#1659:

 - runtime plugin loader for external capture modules
 - timestamp type accessors for adapter code
 - complete accessor API for tcpdump feature parity

The meson.build exposes a plugindir variable via declare_dependency()
so consumers can install plugins in the right location.

Signed-off-by: Robin Jarry <rjarry@redhat.com>

Author: rjarry

.github/workflows/check.yml

@@ -69,7 +69,7 @@ jobs:
           set -xe
           sudo apt-get update -qy
           sudo apt-get install -qy --no-install-recommends \
-            make gcc gdb ccache ninja-build meson git scdoc \
+            make gcc gdb ccache ninja-build meson git scdoc bison flex \
             libibverbs-dev libasan8 libcmocka-dev libedit-dev libarchive-dev \
             libevent-dev libmnl-dev libnuma-dev python3-pyelftools \
             socat tcpdump traceroute graphviz iproute2 iputils-ping ndisc6 jq \
@@ -148,7 +148,7 @@ jobs:
           apt install -qy --no-install-recommends \
             make gcc ccache git meson scdoc python3-pyelftools ca-certificates pkg-config \
             crossbuild-essential-arm64 libcmocka-dev:arm64 libedit-dev:arm64 \
-            libevent-dev:arm64 libmnl-dev:arm64 libnuma-dev:arm64
+            libevent-dev:arm64 libmnl-dev:arm64 libnuma-dev:arm64 bison flex
       - uses: actions/checkout@v4
         with:
           persist-credentials: false

.gitignore

@@ -21,4 +21,5 @@
 /subprojects/dpdk-*
 /subprojects/libecoli-*
 /subprojects/frr-*
+/subprojects/libpcap
 /subprojects/packagecache

subprojects/libpcap.wrap

@@ -0,0 +1,12 @@
+[wrap-git]
+url = https://github.com/the-tcpdump-group/libpcap
+revision = bac2884bfabe20f9ff0f711eb9eb7589569e6a01
+depth = 1
+patch_directory = libpcap
+diff_files =
+	libpcap/0001-plugin-add-runtime-plugin-loader-for-external-captur.patch,
+	libpcap/0002-plugin-expose-timestamp-type-accessors-for-adapter-c.patch,
+	libpcap/0003-plugin-complete-accessor-API-for-tcpdump-feature-par.patch
+
+[provide]
+dependency_names = libpcap