fix freexl for flatpak (#5714)

Author: RensDofferhoff

Desktop/CMakeLists.txt

@@ -148,7 +148,7 @@ target_link_libraries(
     OpenSSL::Crypto
     # FreeXL
     ${LIBFREEXL_LIBRARIES}
-    $<$<NOT:$<BOOL:${LINUX_LOCAL_BUILD}>>:freexl::freexl>
+    $<$<NOT:$<BOOL:${LINUX}>>:freexl::freexl>
     # ReadStat -----------------------------------
     ${LIBREADSTAT_LIBRARIES}
     # MinGW's ReadStat

Tools/CMake/Libraries.cmake

@@ -201,8 +201,8 @@ if(LINUX)
 
   # ---- FreeXL ----
   message(CHECK_START "Looking for `libfreexl`")
-    set(LIBFREEXL_INCLUDE_DIRS /usr/include)
-    set(LIBFREEXL_LIBRARY_DIRS /usr/local/lib /usr/lib /usr/lib/x86_64-linux-gnu /usr/lib/aarch64-linux-gnu)
+    set(LIBFREEXL_INCLUDE_DIRS /usr/include /app/lib64/)
+    set(LIBFREEXL_LIBRARY_DIRS /usr/local/lib /usr/lib /usr/lib/x86_64-linux-gnu /usr/lib/aarch64-linux-gnu /app/include/)
 
   message(CHECK_START "Looking for libfreexl.so")
   find_library(LIBFREEXL_LIBRARIES libfreexl.so