Remove vendored usvfs and Windows-only usvfs code paths

The Linux port uses its own in-process FUSE VFS (FuseConnector), so
usvfs was dead weight: libs/usvfs/ was never built, usvfsconnector.cpp
was explicitly REMOVE_ITEM'd from the source list, and every call site
was already guarded by #ifdef _WIN32 with a working Linux branch (the
Windows build is also broken on this branch, since FUSE3 is a hard
find_package dependency).

- Drop libs/usvfs/ and src/src/usvfsconnector.{cpp,h}
- Collapse #ifdef _WIN32 / usvfs include branches in organizercore,
  mainwindow, settings, util, spawn
- Remove getUsvfsVersionString() and the "usvfs: ..." log field
- Remove vfs32/64DLLName APPPARAMs (nothing reads them)
- Relabel About dialog "usvfs:" row to "VFS: FUSE 3"

1 files changed, 0 insertions, 57 deletions

diff --git a/libs/usvfs/src/usvfs_dll/semaphore.cpp b/libs/usvfs/src/usvfs_dll/semaphore.cpp
deleted file mode 100644
index 609b2f5..0000000
--- a/libs/usvfs/src/usvfs_dll/semaphore.cpp
+++ /dev/null
@@ -1,57 +0,0 @@
-#include "semaphore.h"
-#include "exceptionex.h"
-
-RecursiveBenaphore::RecursiveBenaphore() : m_Counter(0), m_OwnerId(0UL), m_Recursion(0)
-{
-  m_Semaphore = ::CreateSemaphore(nullptr, 1, 1, nullptr);
-}
-
-RecursiveBenaphore::~RecursiveBenaphore()
-{
-  ::CloseHandle(m_Semaphore);
-}
-
-void RecursiveBenaphore::wait(DWORD timeout)
-{
-  DWORD tid = ::GetCurrentThreadId();
-
-  if (::_InterlockedIncrement(&m_Counter) > 1) {
-    if (tid != m_OwnerId) {
-      int tries = 3;
-      while (::WaitForSingleObject(m_Semaphore, timeout) != WAIT_OBJECT_0) {
-        HANDLE owner = ::OpenThread(SYNCHRONIZE, FALSE, m_OwnerId);
-        ON_BLOCK_EXIT([owner]() {
-          ::CloseHandle(owner);
-        });
-        if ((tries <= 0) || (::WaitForSingleObject(owner, 0) == WAIT_OBJECT_0)) {
-          // owner has quit without releasing the semaphore!
-          m_Recursion = 0;
-          spdlog::get("usvfs")->error("thread {} never released the mutex", m_OwnerId);
-          break;
-        } else {
-          --tries;
-        }
-      }
-    }
-  }
-  m_OwnerId = tid;
-  ++m_Recursion;
-}
-
-void RecursiveBenaphore::signal()
-{
-  if (m_Recursion == 0) {
-    return;
-  }
-  // no validation the signaling thread is the one owning the lock
-  DWORD recursion = --m_Recursion;
-  if (recursion == 0) {
-    m_OwnerId = 0;
-  }
-  DWORD result = ::_InterlockedDecrement(&m_Counter);
-  if (result > 0) {
-    if (recursion == 0) {
-      ::ReleaseSemaphore(m_Semaphore, 1, nullptr);
-    }
-  }
-}