Revert "[libc] implement ioctl" (#88226)

Reverts #85890

This fails in full build mode:

https://lab.llvm.org/buildbot/#/builders/163/builds/54478/steps/4/logs/stdio

Author: lntue

libc/config/linux/aarch64/entrypoints.txt

@@ -204,9 +204,6 @@ set(TARGET_LIBC_ENTRYPOINTS
     #libc.src.stdio.scanf
     #libc.src.stdio.fscanf
 
-    # sys/ioctl.h entrypoints
-    libc.src.sys.ioctl.ioctl
-
     # sys/mman.h entrypoints
     libc.src.sys.mman.madvise
     libc.src.sys.mman.mmap

libc/config/linux/riscv/entrypoints.txt

@@ -209,9 +209,6 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.stdio.scanf
     libc.src.stdio.fscanf
 
-    # sys/ioctl.h entrypoints
-    libc.src.sys.ioctl.ioctl
-
     # sys/mman.h entrypoints
     libc.src.sys.mman.madvise
     libc.src.sys.mman.mmap

libc/config/linux/x86_64/entrypoints.txt

@@ -221,9 +221,6 @@ set(TARGET_LIBC_ENTRYPOINTS
     # https://github.com/llvm/llvm-project/issues/80060
     # libc.src.sys.epoll.epoll_pwait2
 
-    # sys/ioctl.h entrypoints
-    libc.src.sys.ioctl.ioctl
-
     # sys/mman.h entrypoints
     libc.src.sys.mman.madvise
     libc.src.sys.mman.mmap

libc/spec/linux.td

@@ -79,24 +79,6 @@ def Linux : StandardSpec<"Linux"> {
       []  // Functions
   >;
 
-  HeaderSpec SysIoctl = HeaderSpec<
-      "sys/ioctl.h",
-      [Macro<"MAP_ANONYMOUS">],
-      [], // Types
-      [], // Enumerations
-      [
-        FunctionSpec<
-            "ioctl",
-            RetValSpec<IntType>,
-            [
-              ArgSpec<IntType>,
-              ArgSpec<UnsignedLongType>,
-              ArgSpec<VoidPtr>,
-            ]
-        >,
-      ]  // Functions
-  >;
-
   HeaderSpec SysMMan = HeaderSpec<
       "sys/mman.h",
       [Macro<"MAP_ANONYMOUS">],

libc/src/sys/CMakeLists.txt

@@ -1,6 +1,5 @@
 add_subdirectory(auxv)
 add_subdirectory(epoll)
-add_subdirectory(ioctl)
 add_subdirectory(mman)
 add_subdirectory(random)
 add_subdirectory(resource)