Fix CMake dependencies for libmosquittopp.

Enables parallel build mode.

Accepted without CLA after discussion with Eclipse Foundation legal
about very small patches that can only be implemented in one way.

See bug report for acceptance of Certificate of Origin.

Bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=463884
Also-by: Gianfranco Costamagna <costamagnagianfranco@yahoo.it>

ChangeLog.txt

@@ -9,6 +9,7 @@ Client library:
 - Inflight message count wasn't being decreased for outgoing messages using
   QoS 2, meaning that only up to 20 QoS 2 messages could be sent. This has
   been fixed. Closes #464436.
+- Fix CMake dependencies for C++ wrapper building. Closes #463884.
 
 
 1.4.1 - 20150403

lib/cpp/CMakeLists.txt

@@ -5,7 +5,7 @@ link_directories(${mosquitto_BINARY_DIR}/lib)
 add_library(mosquittopp SHARED
 	mosquittopp.cpp mosquittopp.h)
 
-target_link_libraries(mosquittopp mosquitto)
+target_link_libraries(mosquittopp libmosquitto)
 set_target_properties(mosquittopp PROPERTIES
 	VERSION ${VERSION}
 	SOVERSION 1