Linux Build Fixes

- fixed AppImage not accepting arguments (for example -f -g ROM_file to start directly)
- adjusted AppImage build.sh so it can find Qt libs on Fedora (#98)
- perl-Digest-SHA package is needed for shasum on Fedora
- added option do disable linking against LLVM 17 (Steam Deck specific)
- updated build-for-linux.md (Steam Deck specific)

CMakeLists.txt

@@ -70,6 +70,8 @@ option(YUZU_DOWNLOAD_TIME_ZONE_DATA "Always download time zone binaries" OFF)
 
 option(YUZU_ENABLE_PORTABLE "Allow yuzu to enable portable mode if a user folder is found in the CWD" ON)
 
+option(YUZU_USE_LLVM_DEMANGLE "Use LLVM Demangle" ON)
+
 CMAKE_DEPENDENT_OPTION(YUZU_USE_FASTER_LD "Check if a faster linker is available" ON "NOT WIN32" OFF)
 
 CMAKE_DEPENDENT_OPTION(USE_SYSTEM_MOLTENVK "Use the system MoltenVK lib (instead of the bundled one)" OFF "APPLE" OFF)
@@ -299,7 +301,9 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/bin)
 find_package(Boost 1.79.0 REQUIRED context)
 find_package(enet 1.3 MODULE)
 find_package(fmt REQUIRED)
-find_package(LLVM 17.0.2 MODULE COMPONENTS Demangle)
+if (YUZU_USE_LLVM_DEMANGLE)
+    find_package(LLVM 17.0.2 MODULE COMPONENTS Demangle)
+endif()
 find_package(lz4 REQUIRED)
 find_package(nlohmann_json 3.8 REQUIRED)
 find_package(Opus 1.3 MODULE)