Add missing unistd.h include after r8765.

src/ports/SkFontHost_fontconfig.cpp

 /*
  * Copyright 2008 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkFontConfigInterface.h"
 #include "SkFontDescriptor.h"
 #include "SkFontHost.h"
@@ skipping 219 matching lines @@
     const char* last = strrchr(str, '/');
     return last ? last + 1 : NULL;
 }
 
 static bool is_lower(char c) {
     return c >= 'a' && c <= 'z';
 }
 
 #include "SkFontMgr.h"
 #include <fontconfig/fontconfig.h>
+#include <unistd.h>
 
 static int get_int(FcPattern* pattern, const char field[]) {
     int value;
     if (FcPatternGetInteger(pattern, field, 0, &value) != FcResultMatch) {
         value = SK_MinS32;
     }
     return value;
 }
 
 static const char* get_name(FcPattern* pattern, const char field[]) {
@@ skipping 220 matching lines @@
     }
     virtual SkTypeface* onCreateFromFile(const char path[], int ttcIndex) {
         return NULL;
     }
 };
 
 SkFontMgr* SkFontMgr::Factory() {
     SkFontConfigInterface* fci = RefFCI();
     return fci ? SkNEW_ARGS(SkFontMgr_fontconfig, (fci)) : NULL;
 }