subprojects: add libpcap with plugin loader support

The packet capture feature needs libpcap with the plugin loader
API proposed in the-tcpdump-group/libpcap#1659
which is not yet merged upstream. Add libpcap as a meson wrap
subproject with three patches on top of upstream commit bac2884b
implementing the runtime plugin loader, timestamp type accessors
and a 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

@@ -77,7 +77,7 @@ jobs:
           # grout dependencies
           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 \

.gitignore

@@ -21,5 +21,6 @@
 /subprojects/dpdk-*
 /subprojects/libecoli-*
 /subprojects/frr-*
+/subprojects/libpcap
 /subprojects/packagecache
 /subprojects/.wraplock

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