Fixes #361, by incorperating Ferdnyc's changes in OpenShot/libopenshot, previously cppzmq was not looking for the correct names, and rejected valid static library names when looking for zmq on windows, this fix aims to include those other names

Author: Cazadorro

libzmq-pkg-config/FindZeroMQ.cmake

@@ -3,24 +3,32 @@ find_package(PkgConfig)
 pkg_check_modules(PC_LIBZMQ QUIET libzmq)
 
 set(ZeroMQ_VERSION ${PC_LIBZMQ_VERSION})
-find_library(ZeroMQ_LIBRARY NAMES libzmq.so libzmq.dylib libzmq.dll
-             PATHS ${PC_LIBZMQ_LIBDIR} ${PC_LIBZMQ_LIBRARY_DIRS})
-find_library(ZeroMQ_STATIC_LIBRARY NAMES libzmq-static.a libzmq.a libzmq.dll.a
-             PATHS ${PC_LIBZMQ_LIBDIR} ${PC_LIBZMQ_LIBRARY_DIRS})
 
-if(ZeroMQ_LIBRARY OR ZeroMQ_STATIC_LIBRARY)
+find_path(ZeroMQ_INCLUDE_DIR zmq.h
+        PATHS ${ZeroMQ_DIR}/include
+        ${PC_LIBZMQ_INCLUDE_DIRS})
+
+find_library(ZeroMQ_LIBRARY
+        NAMES zmq
+        PATHS ${ZeroMQ_DIR}/lib
+        ${PC_LIBZMQ_LIBDIR}
+        ${PC_LIBZMQ_LIBRARY_DIRS})
+
+if(ZeroMQ_LIBRARY)
     set(ZeroMQ_FOUND ON)
 endif()
 
-if (TARGET libzmq)
-    # avoid errors defining targets twice
-    return()
-endif()
+set ( ZeroMQ_LIBRARIES ${ZeroMQ_LIBRARY} )
+set ( ZeroMQ_INCLUDE_DIRS ${ZeroMQ_INCLUDE_DIR} )
 
-add_library(libzmq SHARED IMPORTED)
-set_property(TARGET libzmq PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${PC_LIBZMQ_INCLUDE_DIRS})
-set_property(TARGET libzmq PROPERTY IMPORTED_LOCATION ${ZeroMQ_LIBRARY})
+if(NOT TARGET libzmq)
+    add_library(libzmq UNKNOWN IMPORTED)
+    set_target_properties(libzmq PROPERTIES
+            IMPORTED_LOCATION ${ZeroMQ_LIBRARIES}
+            INTERFACE_INCLUDE_DIRECTORIES ${ZeroMQ_INCLUDE_DIRS})
+endif()
 
-add_library(libzmq-static STATIC IMPORTED ${PC_LIBZMQ_INCLUDE_DIRS})
-set_property(TARGET libzmq-static PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${PC_LIBZMQ_INCLUDE_DIRS})
-set_property(TARGET libzmq-static PROPERTY IMPORTED_LOCATION ${ZeroMQ_STATIC_LIBRARY})
+include ( FindPackageHandleStandardArgs )
+# handle the QUIETLY and REQUIRED arguments and set ZMQ_FOUND to TRUE
+# if all listed variables are TRUE
+find_package_handle_standard_args ( ZeroMQ DEFAULT_MSG ZeroMQ_LIBRARIES ZeroMQ_INCLUDE_DIRS )