Fix building on musl libc.

src/client/linux/dump_writer_common/ucontext_reader.cc

 // Copyright (c) 2014, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 31 matching lines @@
 
 uintptr_t UContextReader::GetStackPointer(const struct ucontext* uc) {
   return uc->uc_mcontext.gregs[REG_ESP];
 }
 
 uintptr_t UContextReader::GetInstructionPointer(const struct ucontext* uc) {
   return uc->uc_mcontext.gregs[REG_EIP];
 }
 
 void UContextReader::FillCPUContext(RawContextCPU *out, const ucontext *uc,
-                                    const struct _libc_fpstate* fp) {
+                                    const struct _fpstate* fp) {
   const greg_t* regs = uc->uc_mcontext.gregs;
 
   out->context_flags = MD_CONTEXT_X86_FULL |
                        MD_CONTEXT_X86_FLOATING_POINT;
 
   out->gs = regs[REG_GS];
   out->fs = regs[REG_FS];
   out->es = regs[REG_ES];
   out->ds = regs[REG_DS];
 
@@ skipping 27 matching lines @@
 
 uintptr_t UContextReader::GetStackPointer(const struct ucontext* uc) {
   return uc->uc_mcontext.gregs[REG_RSP];
 }
 
 uintptr_t UContextReader::GetInstructionPointer(const struct ucontext* uc) {
   return uc->uc_mcontext.gregs[REG_RIP];
 }
 
 void UContextReader::FillCPUContext(RawContextCPU *out, const ucontext *uc,
-                                    const struct _libc_fpstate* fpregs) {
+                                    const struct _fpstate* fpregs) {
   const greg_t* regs = uc->uc_mcontext.gregs;
 
   out->context_flags = MD_CONTEXT_AMD64_FULL;
 
   out->cs = regs[REG_CSGSFS] & 0xffff;
 
   out->fs = (regs[REG_CSGSFS] >> 32) & 0xffff;
   out->gs = (regs[REG_CSGSFS] >> 16) & 0xffff;
 
   out->eflags = regs[REG_EFL];
@@ skipping 139 matching lines @@
     out->float_save.regs[i] = uc->uc_mcontext.fpregs.fp_r.fp_dregs[i];
 
   out->float_save.fpcsr = uc->uc_mcontext.fpc_csr;
 #if _MIPS_SIM == _ABIO32
   out->float_save.fir = uc->uc_mcontext.fpc_eir;  // Unused.
 #endif
 }
 #endif
 
 }  // namespace google_breakpad