pkg: Add a dependency to pcre2

But keep the current pcre dependency, they can both coexist.

Refs varnishcache/varnish-cache#3616

alpine/APKBUILD

@@ -20,7 +20,7 @@ license="BSD"
 options="!check" # tests pass, but ran before packaging
 depends="gcc libc-dev libgcc"
 depends_dev=
-makedepends="$depends_dev pcre-dev ncurses-dev libedit-dev py-docutils
+makedepends="$depends_dev pcre-dev pcre2-dev ncurses-dev libedit-dev py-docutils
 	linux-headers libunwind-dev python3 py3-sphinx"
 install="$pkgname.pre-install"
 subpackages="$pkgname-dbg $pkgname-dev $pkgname-doc $pkgname-libs"

debian/control

@@ -8,6 +8,7 @@ Build-Depends:
  libedit-dev,
  libjemalloc-dev,
  libncurses-dev,
+ libpcre2-dev,
  libpcre3-dev,
  pkg-config,
  python3-docutils,

redhat/varnish.spec

@@ -21,6 +21,7 @@ BuildRequires: libedit-devel
 BuildRequires: make
 BuildRequires: ncurses-devel
 BuildRequires: pcre-devel
+BuildRequires: pcre2-devel
 BuildRequires: pkgconfig
 BuildRequires: python3
 BuildRequires: python3-sphinx