remove obsolete SuperH support

We don't have a toolchain anymore, we don't have working original
kernel headers, and nobody is maintaining this so there is really
no point in keeping this here. Details of the patch:

- removed code paths from Android.mk files related to the SuperH
  architecture ("sh")

- removed libc/arch-sh, linker/arch-sh, libc/kernel/arch-sh

- simplified libc/SYSCALLS.TXT

- simplified the scripts in libc/tools/ and libc/kernel/tools

Change-Id: I26b0e1422bdc347489e4573e2fbec0e402f75560

Signed-off-by: David 'Digit' Turner <digit@android.com>
diff --git a/libc/kernel/tools/defaults.py b/libc/kernel/tools/defaults.py
index 2bee4ec..aa68e7c 100644
--- a/libc/kernel/tools/defaults.py
+++ b/libc/kernel/tools/defaults.py
@@ -7,7 +7,7 @@
 
 # the list of supported architectures
 #
-kernel_archs = [ 'arm', 'x86', 'sh' ]
+kernel_archs = [ 'arm', 'x86' ]
 
 # the list of include directories that belong to the kernel
 # tree. used when looking for sources...
@@ -66,15 +66,6 @@
         ]
     )
 
-kernel_known_sh_statics = set(
-       [ "___arch__swab16",    # asm-sh/byteorder.h
-         "___arch__swab32",    # asm-sh/byteorder.h
-         "___arch__swab64",    # asm-sh/byteorder.h
-         "__FD_ZERO",          # asm-sh/posix_types_32/64.h
-         "__FD_SET",           # asm-sh/posix_types_32/64.h
-       ]
-    )
-
 kernel_known_generic_statics = set(
         [ "__invalid_size_argument_for_IOC",  # asm-generic/ioctl.h
           "__cmsg_nxthdr",                    # linux/socket.h
@@ -90,7 +81,6 @@
 kernel_known_statics = {
         "arm" : kernel_known_arm_statics,
         "x86" : kernel_known_x86_statics,
-        "sh" : kernel_known_sh_statics
     }
 
 # this is a list of macros which we want to specifically exclude from