Fixes up dump_syms build on OS X so it works with ELF.

src/tools/mac/dump_syms/dump_syms.xcodeproj/project.pbxproj

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@@ skipping 224 matching lines @@
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@@ skipping 313 matching lines @@
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                         );
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@@ skipping 254 matching lines @@
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                         compatibilityVersion = "Xcode 3.1";
                         developmentRegion = English;
                         hasScannedForEncodings = 1;
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@@ skipping 47 matching lines @@
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@@ skipping 97 matching lines @@
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                         buildSettings = {
-                                HEADER_SEARCH_PATHS = ../../..;
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+                                        ../../../third_party/glibc/elf/,
+                                );
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                         buildSettings = {
-                                HEADER_SEARCH_PATHS = ../../..;
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@@ skipping 365 matching lines @@
                                 PRODUCT_NAME = macho_reader_unittest;
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                         buildSettings = {
                                 GCC_PREPROCESSOR_DEFINITIONS = HAVE_MACH_O_NLIST_H;
                                 GCC_VERSION = "";
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                         isa = XCBuildConfiguration;
                         buildSettings = {
                                 GCC_PREPROCESSOR_DEFINITIONS = HAVE_MACH_O_NLIST_H;
                                 GCC_VERSION = "";
                                 PRODUCT_NAME = dump_syms;
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@@ skipping 171 matching lines @@
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