Restore simple LIB_SPEC using just -lc

gcc/config/i386/nacl.h

 /* Target definitions for GCC for NativeClient using ELF
    Copyright (C) 1988, 1991, 1995, 2000, 2001, 2002
    Free Software Foundation, Inc.
 
    Derived from sysv4.h written by Ron Guilmette (rfg@netcom.com).
 
 This file is part of GCC.
 
 GCC is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ skipping 73 matching lines @@
 /* Pass the NativeClient specific options to the assembler.  */
 #undef  ASM_SPEC
 #define ASM_SPEC \
   "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} " \
   "%{fnacl-library-mode:-nacl-library-mode} " \
   "%{fnacl-align-16:-nacl-align=4} " \
   "%{fnacl-align-32:-nacl-align=5} " \
   "%{Ym,*} %{Yd,*} %{Wa,*:%*} %{m32:--32} %{m64:--64} " \
   "%{!mno-sse2avx:%{mavx:-msse2avx}} %{msse2avx:%{!mavx:-msse2avx}}"
 
-/* `crt_platform' contains low-level platform-specific intrinsics in C.  */
 #undef  LIB_SPEC
 #define LIB_SPEC \
   "%{pthread:-lpthread} \
-   %{mieee-fp:-lieee} %{profile:-lc_p}%{!profile:-lc} \
-   -lnacl \
-   %{mieee-fp:-lieee} %{profile:-lc_p}%{!profile:-lc} \
-   %{lnosys:-lnosys} \
-   -lcrt_platform \
-   %{mieee-fp:-lieee} %{profile:-lc_p}%{!profile:-lc}"
+   %{shared:-lc} \
+   %{!shared:%{mieee-fp:-lieee} %{profile:-lc_p}%{!profile:-lc}}"
 
 /* Define this so we can compile MS code for use with WINE.  */
 #define HANDLE_PRAGMA_PACK_PUSH_POP
 
 #if defined(HAVE_LD_EH_FRAME_HDR)
 #define LINK_EH_SPEC "%{!static:--eh-frame-hdr} "
 #endif
 
 /* Use --as-needed -lgcc_s for eh support.  */
 #ifdef HAVE_LD_AS_NEEDED
@@ skipping 178 matching lines @@
 #undef TARGET_USE_BT
 #define TARGET_USE_BT           (ix86_tune_features[X86_TUNE_USE_BT] && !TARGET_NACL)
 
 #undef DBX_REGISTER_NUMBER
 #define DBX_REGISTER_NUMBER(n) \
   (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
 
 #define DWARF2_ADDR_SIZE \
     (TARGET_NACL ? (TARGET_64BIT ? 8 : 4) : \
                    (POINTER_SIZE / BITS_PER_UNIT))