build: fix CMake system include directives

The CMake `SYSTEM` modifier of `target_include_directories()` must come
before the visibility specification. However, it was accidentally in the
wrong order, so it was simply adding a directory named `SYSTEM` to the
target's include paths.

Fix it to correctly request the include paths to be treated as system
include paths.

Author: Isaac Garzon

CMakeLists.txt

@@ -126,7 +126,7 @@ if(ENABLE_OPENMP)
         target_compile_options(slvs_openmp INTERFACE ${OpenMP_CXX_FLAGS})
         target_link_libraries(slvs_openmp INTERFACE
             ${OpenMP_CXX_LIBRARIES})
-        target_include_directories(slvs_openmp INTERFACE SYSTEM
+        target_include_directories(slvs_openmp SYSTEM INTERFACE
             ${OpenMP_CXX_INCLUDE_DIRS})
         message(STATUS "found OpenMP, compiling with flags: " ${OpenMP_CXX_FLAGS} )
     endif()

src/CMakeLists.txt

@@ -21,7 +21,7 @@ configure_file(${CMAKE_CURRENT_SOURCE_DIR}/config.h.in
 
 # solvespace dependencies
 add_library(slvs_deps INTERFACE)
-target_include_directories(slvs_deps INTERFACE SYSTEM
+target_include_directories(slvs_deps SYSTEM INTERFACE
     ${OPENGL_INCLUDE_DIR}
     ${ZLIB_INCLUDE_DIR}
     ${PNG_PNG_INCLUDE_DIR}
@@ -38,14 +38,14 @@ target_link_libraries(slvs_deps INTERFACE
     mimalloc-static)
 
 if(Backtrace_FOUND)
-    target_include_directories(slvs_deps INTERFACE SYSTEM
+    target_include_directories(slvs_deps SYSTEM INTERFACE
         ${Backtrace_INCLUDE_DIRS})
     target_link_libraries(slvs_deps INTERFACE
         ${Backtrace_LIBRARY})
 endif()
 
 if(SPACEWARE_FOUND)
-    target_include_directories(slvs_deps INTERFACE SYSTEM
+    target_include_directories(slvs_deps SYSTEM INTERFACE
         ${SPACEWARE_INCLUDE_DIR})
     target_link_libraries(slvs_deps INTERFACE
         ${SPACEWARE_LIBRARIES})
@@ -421,7 +421,7 @@ if(ENABLE_GUI)
         target_sources(solvespace PRIVATE
             platform/guigtk.cpp)
 
-        target_include_directories(solvespace PRIVATE SYSTEM
+        target_include_directories(solvespace SYSTEM PRIVATE
             ${GTKMM_INCLUDE_DIRS}
             ${JSONC_INCLUDE_DIRS}
             ${FONTCONFIG_INCLUDE_DIRS})