fix Linux installation creating broken superslicer-gcodeviewer symlink (

#4208)

Currently the symlink target is hardcoded as slic3r, which is not the
binary name of SuperSlicer.

Change it to use the variable for application command name instead.

Signed-off-by: Icenowy Zheng <uwu@icenowy.me>

src/CMakeLists.txt

@@ -303,5 +303,5 @@ else ()
     install(TARGETS Slic3r RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
 
     # Install the symlink for gcodeviewer
-    install(CODE "execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink slic3r ${GCODEVIEWER_APP_CMD} WORKING_DIRECTORY \$ENV{DESTDIR}/${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR})")
+    install(CODE "execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink ${SLIC3R_APP_CMD} ${GCODEVIEWER_APP_CMD} WORKING_DIRECTORY \$ENV{DESTDIR}/${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR})")
 endif ()