Moved CMake modules to a separate directory and disabled local installs of system files when building packages.

The building of packages with CMake now requires the -DPACKAGE=Y flag to be set when configuring CMake.

cmake/FindRabbitMQ.cmake

@@ -0,0 +1,23 @@
+# This CMake file tries to find the the RabbitMQ library
+# The following variables are set:
+# RABBITMQ_FOUND - System has RabbitMQ client
+# RABBITMQ_LIBRARIES - The RabbitMQ client library
+# RABBITMQ_HEADERS - The RabbitMQ client headers
+include(CheckCSourceCompiles)
+find_library(RABBITMQ_LIBRARIES NAMES rabbitmq)
+find_path(RABBITMQ_HEADERS amqp.h PATH_SUFFIXES mysql mariadb)
+
+if(${RABBITMQ_LIBRARIES} MATCHES "NOTFOUND")
+  set(RABBITMQ_FOUND FALSE CACHE INTERNAL "")
+  message(STATUS "RabbitMQ library not found.")
+  unset(RABBITMQ_LIBRARIES)
+else()
+  set(RABBITMQ_FOUND TRUE CACHE INTERNAL "")
+  message(STATUS "Found RabbitMQ library: ${RABBITMQ_LIBRARIES}")
+endif()
+
+set(CMAKE_REQUIRED_INCLUDES ${RABBITMQ_HEADERS})
+check_c_source_compiles("#include <amqp.h>\n int main(){if(AMQP_DELIVERY_PERSISTENT){return 0;}return 1;}" HAVE_RABBITMQ50)
+if(NOT HAVE_RABBITMQ50)
+  message(FATAL_ERROR "Old version of RabbitMQ-C library found. Version 0.5 or newer is required.")
+endif()