libpqxx: adding Makefile, Config.in and patch

Signed-off-by: Igor Bezzubchenko <garikello@gmail.com>

libs/libpqxx/Config.in

@@ -0,0 +1,26 @@
+menu "Options"
+	 depends on PACKAGE_libpqxx
+
+config LIBPQXX_STATIC
+    bool "Build static library"
+	default y
+	help
+		Build static (.a) library
+
+config LIBPQXX_SHARED
+    bool "Build and install shared library"
+	default n
+	help
+		Build and install shared (.so) library
+
+config LIBPQXX_INSTALL_TEST
+    bool "Build and install test suite"
+	default n
+	depends on LIBPQXX_STATIC || LIBPQXX_SHARED
+	help
+		Build and install a test suite against a real server.
+		One can run this suite on a target platform to ensure
+		that the library is built the way it should and operating
+		correctly.
+
+endmenu