Refactor sym_upload in tools to extract code into common/linux, and minor fixes

Makefile.am

 ## Process this file with automake to produce Makefile.in
 
 # Copyright (c) 2011, 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
@@ skipping 562 matching lines @@
         src/common/linux/memory_mapped_file.cc \
         src/tools/linux/md2core/minidump-2-core.cc
 
 src_tools_linux_symupload_minidump_upload_SOURCES = \
         src/common/linux/http_upload.cc \
         src/tools/linux/symupload/minidump_upload.cc
 src_tools_linux_symupload_minidump_upload_LDADD = -ldl
 
 src_tools_linux_symupload_sym_upload_SOURCES = \
         src/common/linux/http_upload.cc \
+        src/common/linux/symbol_upload.cc \
         src/tools/linux/symupload/sym_upload.cc
 src_tools_linux_symupload_sym_upload_LDADD = -ldl
 
 src_tools_mac_dump_syms_dump_syms_mac_SOURCES = \
         src/common/dwarf_cfi_to_module.cc \
         src/common/dwarf_cu_to_module.cc \
         src/common/dwarf_line_to_module.cc \
         src/common/language.cc \
         src/common/md5.cc \
         src/common/module.cc \
@@ skipping 654 matching lines @@
         src/common/linux/elf_symbols_to_module.cc \
         src/common/linux/elf_symbols_to_module.h \
         src/common/linux/elfutils.cc \
         src/common/linux/elfutils.h \
         src/common/linux/file_id.cc \
         src/common/linux/file_id.h \
         src/common/linux/guid_creator.cc \
         src/common/linux/guid_creator.h \
         src/common/linux/http_upload.cc \
         src/common/linux/http_upload.h \
+        src/common/linux/symbol_upload.cc \
+        src/common/linux/symbol_upload.h \
         src/common/mac/HTTPMultipartUpload.h \
         src/common/mac/HTTPMultipartUpload.m \
         src/common/mac/dump_syms.h \
         src/common/mac/dump_syms.cc \
         src/common/mac/file_id.cc \
         src/common/mac/file_id.h \
         src/common/mac/macho_id.cc \
         src/common/mac/macho_id.h \
         src/common/mac/macho_utilities.cc \
         src/common/mac/macho_utilities.h \
@@ skipping 60 matching lines @@
         src/tools/windows/dump_syms/dump_syms.vcproj \
         src/tools/windows/dump_syms/run_regtest.sh \
         src/tools/windows/dump_syms/testdata/dump_syms_regtest.cc \
         src/tools/windows/dump_syms/testdata/dump_syms_regtest.pdb \
         src/tools/windows/dump_syms/testdata/dump_syms_regtest.sym \
         src/tools/windows/symupload/symupload.cc \
         src/tools/windows/symupload/symupload.vcproj
 
 mostlyclean-local:
         -find src -name '*.dwo' -exec rm -f {} +