Switch kernel header parsing to python libclang

Replace the tokenizer in cpp.py with libclang.

Bug: 18937958
Change-Id: I27630904c6d2849418cd5ca3d3c612ec3078686d
diff --git a/libc/kernel/uapi/linux/elf-fdpic.h b/libc/kernel/uapi/linux/elf-fdpic.h
index 4441890..45a56e4 100644
--- a/libc/kernel/uapi/linux/elf-fdpic.h
+++ b/libc/kernel/uapi/linux/elf-fdpic.h
@@ -22,16 +22,16 @@
 #define PT_GNU_STACK (PT_LOOS + 0x474e551)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct elf32_fdpic_loadseg {
- Elf32_Addr addr;
- Elf32_Addr p_vaddr;
- Elf32_Word p_memsz;
+  Elf32_Addr addr;
+  Elf32_Addr p_vaddr;
+  Elf32_Word p_memsz;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
 struct elf32_fdpic_loadmap {
- Elf32_Half version;
- Elf32_Half nsegs;
+  Elf32_Half version;
+  Elf32_Half nsegs;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- struct elf32_fdpic_loadseg segs[];
+  struct elf32_fdpic_loadseg segs[];
 };
 #define ELF32_FDPIC_LOADMAP_VERSION 0x0000
 #endif