lavapipe: replace dup() with os_dupfd_cloexec()

dup() will leak the new FD into any child process after fork().

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26203>

src/gallium/frontends/lavapipe/lvp_device.c

@@ -37,6 +37,7 @@
 #include "frontend/drisw_api.h"
 
 #include "util/u_inlines.h"
+#include "util/os_file.h"
 #include "util/os_memory.h"
 #include "util/os_time.h"
 #include "util/u_thread.h"
@@ -2400,7 +2401,7 @@ lvp_GetMemoryFdKHR(VkDevice _device, const VkMemoryGetFdInfoKHR *pGetFdInfo, int
    assert(pGetFdInfo->sType == VK_STRUCTURE_TYPE_MEMORY_GET_FD_INFO_KHR);
    assert_memhandle_type(pGetFdInfo->handleType);
 
-   *pFD = dup(memory->backed_fd);
+   *pFD = os_dupfd_cloexec(memory->backed_fd);
    assert(*pFD >= 0);
    return VK_SUCCESS;
 }