Add pcre-lib for uwsgi

Building the wheel with PCRE support may improve
performance, but at the very least gets rid of
a nasty log message. We prefer our logs not to
have nasty messages in them, so we add the extra
package.

Change-Id: Ibab309445f9398b6f48dc9ea12d89056d14b7a71
Closes-Bug: #1742538

vars/redhat.yml

@@ -27,6 +27,7 @@ repo_build_distro_packages:
   - MariaDB-devel           # required to build MySQL-python
   - moreutils               # provides `ts` command to timestamp pip logs
   - openldap-devel          # required to build python-ldap
+  - pcre-devel              # required to build uwsgi
   - postgresql-devel        # required to build psycopg2
   - python2-devel
   - openssl-devel           # required to build cryptography

vars/suse-42.yml

@@ -31,6 +31,7 @@ repo_build_distro_packages:
   - cyrus-sasl-devel        # required to build python-ldap
   - openldap2-devel         # required to build python-ldap
   - postgresql-devel        # required to build psycopg2
+  - pcre-devel              # required to build uwsgi
   - python-devel
   - libopenssl-devel        # required to build cryptography
   - sqlite2-devel           # required to build pysqlite

vars/ubuntu-16.04.yml

@@ -31,6 +31,7 @@ repo_build_distro_packages:
   - libkrb5-dev             # required to build pykerberos
   - libldap2-dev            # required to build python-ldap
   - libmariadbclient-dev    # required to build MySQL-python
+  - libpcre3-dev            # required to build uwsgi
   - libpq-dev               # required to build psycopg2
   - libsasl2-dev            # required to build python-ldap
   - libsqlite3-dev          # required to build pysqlite