Some adaptions for Linux/Raspberry Pi OS

[Gemba]

Hi there.
Thanks for the Linux adaptions and esp. for the libretro core.

The LR core works fine on the current RetroPie (based on Buster) with some adaptions, see full story there: https://retropie.org.uk/forum/post/284130

TL;DR:

1. Workaround: static linking for stdc++ filesystem with GCC before v9 (C++17 Standard is supported but stdc++fs is marked experimental in GCC8):

diff --git a/source/frontends/libretro/CMakeLists.txt b/source/frontends/libretro/CMakeLists.txt
index 77c48a9f..3c1cce76 100644
--- a/source/frontends/libretro/CMakeLists.txt
+++ b/source/frontends/libretro/CMakeLists.txt
@@ -41,7 +41,12 @@ target_include_directories(applewin_libretro PRIVATE
   libretro-common/include
   )
 
+set(is_gnu "$<CXX_COMPILER_ID:GNU>")
+set(before_v9 "$<VERSION_LESS:$<CXX_COMPILER_VERSION>,9>")
+set(static_stdcpp_fs "$<AND:${is_gnu},${before_v9}>")
+
 target_link_libraries(applewin_libretro PRIVATE
+  $<${static_stdcpp_fs}:stdc++fs>
   appleii
   common2
   windows

2. Minor: Update to raspbian.list.txt

diff --git a/source/linux/raspbian.list.txt b/source/linux/raspbian.list.txt
index 6feacc72..a40d8296 100644
--- a/source/linux/raspbian.list.txt
+++ b/source/linux/raspbian.list.txt
@@ -13,3 +13,5 @@ libsdl2-dev
 libgles-dev
 libpcap-dev
 libslirp-dev
+libminizip-dev
+libyaml-dev

Maybe you can apply it in the mainline?

[audetto]

Sure.
Do you want to open a PR?

[Gemba]

Please find accompanied PR.

[Gemba]

Thanks for merging.