build: SYSTEM_CIMG and SYSTEM_NODESOUP options include MATPLOTPP prefix

Author: traversaro

source/3rd_party/CMakeLists.txt

@@ -1,7 +1,7 @@
 #######################################################
 ### NodeSoup                                        ###
 #######################################################
-if(WITH_SYSTEM_NODESOUP)
+if(MATPLOTPP_WITH_SYSTEM_NODESOUP)
   find_path(NODESOUP_INCLUDE_DIR nodesoup.hpp REQUIRED)
   find_library(NODESOUP_LIB nodesoup REQUIRED)
 
@@ -52,7 +52,7 @@ endif()
 ### CImg                                            ###
 #######################################################
 add_library(cimg INTERFACE)
-if(WITH_SYSTEM_CIMG)
+if(MATPLOTPP_WITH_SYSTEM_CIMG)
   find_path(CIMG_INCLUDE_DIR CImg.h REQUIRED)
 else()
   set(CIMG_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/cimg)
@@ -153,4 +153,4 @@ endif()
 if(MASTER_PROJECT AND NOT BUILD_SHARED_LIBS)
   install(TARGETS cimg
       EXPORT Matplot++Targets)
-endif()
+endif()