[libc] remove toplevel vdso and non-linux vdso

Author: SchrodingerZhu

libc/src/__support/OSUtil/CMakeLists.txt

@@ -15,11 +15,3 @@ add_object_library(
   DEPENDS
     ${target_os_util}
 )
-
-add_header_library(
-  vdso
-  HDRS
-    vdso.h
-  DEPENDS
-    .${LIBC_TARGET_OS}.vdso
-)

libc/src/__support/OSUtil/fuchsia/vdso.h

@@ -7,6 +7,6 @@ add_libc_test(
   SUITE libc-osutil-tests
   SRCS vdso_test.cpp
   DEPENDS
-    libc.src.__support.OSUtil.vdso
+    libc.src.__support.OSUtil.linux.vdso
     libc.hdr.types.struct_timeval
 )

libc/src/__support/OSUtil/vdso.h

@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "hdr/types/struct_timeval.h"
-#include "src/__support/OSUtil/vdso.h"
+#include "src/__support/OSUtil/linux/vdso.h"
 #include "test/UnitTest/Test.h"
 
 namespace LIBC_NAMESPACE {