Support building against Percona Server builds of MySQL client librar…

…y `libperconaserverclient` (#718)

setup.py

@@ -15,7 +15,7 @@
 def find_package_name():
     """Get available pkg-config package name"""
     # Ubuntu uses mariadb.pc, but CentOS uses libmariadb.pc
-    packages = ["mysqlclient", "mariadb", "libmariadb"]
+    packages = ["mysqlclient", "mariadb", "libmariadb", "perconaserverclient"]
     for pkg in packages:
         try:
             cmd = f"pkg-config --exists {pkg}"