Remove obsolete unistd.h file

The presence of this file can cause build issues when integrating glslang
into other projects.

glslang.vcxproj

@@ -643,7 +643,6 @@ xcopy /y $(IntDir)$(TargetName)$(TargetExt) Test</Command>
     <ClInclude Include="glslang\MachineIndependent\SymbolTable.h" />
     <ClInclude Include="glslang\Include\Types.h" />
     <ClInclude Include="glslang\Include\intermediate.h" />
-    <ClInclude Include="glslang\MachineIndependent\unistd.h" />
     <ClInclude Include="glslang\Public\ShaderLang.h" />
     <ClInclude Include="glslang\OSDependent\Windows\osinclude.h" />
     <ClInclude Include="glslang\OSDependent\Linux\osinclude.h" />
@@ -704,4 +703,4 @@ cd %(RootDir)%(Directory)
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
\ No newline at end of file
+</Project>

glslang.vcxproj.filters

@@ -165,9 +165,6 @@
     <ClInclude Include="glslang\Include\intermediate.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="glslang\MachineIndependent\unistd.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
     <ClInclude Include="glslang\Public\ShaderLang.h">
       <Filter>Public</Filter>
     </ClInclude>
@@ -204,4 +201,4 @@
       <Filter>Machine Independent</Filter>
     </CustomBuild>
   </ItemGroup>
-</Project>
\ No newline at end of file
+</Project>

glslang/CMakeLists.txt

@@ -63,7 +63,6 @@ set(HEADERS
     MachineIndependent/Scan.h
     MachineIndependent/ScanContext.h
     MachineIndependent/SymbolTable.h
-    MachineIndependent/unistd.h
     MachineIndependent/Versions.h
     MachineIndependent/preprocessor/PpContext.h
     MachineIndependent/preprocessor/PpTokens.h)

glslang/MachineIndependent/unistd.h

-// This is a NULL file and is meant to be empty

glslang_vs2010.vcxproj

@@ -366,7 +366,6 @@ xcopy /y $(IntDir)$(TargetName)$(TargetExt) Test</Command>
     <ClInclude Include="glslang\MachineIndependent\SymbolTable.h" />
     <ClInclude Include="glslang\Include\Types.h" />
     <ClInclude Include="glslang\Include\intermediate.h" />
-    <ClInclude Include="glslang\MachineIndependent\unistd.h" />
     <ClInclude Include="glslang\Public\ShaderLang.h" />
     <ClInclude Include="glslang\OSDependent\Windows\osinclude.h" />
     <ClInclude Include="glslang\OSDependent\Linux\osinclude.h" />
@@ -403,4 +402,4 @@ cd %(RootDir)%(Directory)
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
\ No newline at end of file
+</Project>

glslang_vs2013.vcxproj

@@ -366,7 +366,6 @@ xcopy /y $(IntDir)$(TargetName)$(TargetExt) Test</Command>
     <ClInclude Include="glslang\MachineIndependent\SymbolTable.h" />
     <ClInclude Include="glslang\Include\Types.h" />
     <ClInclude Include="glslang\Include\intermediate.h" />
-    <ClInclude Include="glslang\MachineIndependent\unistd.h" />
     <ClInclude Include="glslang\Public\ShaderLang.h" />
     <ClInclude Include="glslang\OSDependent\Windows\osinclude.h" />
     <ClInclude Include="glslang\OSDependent\Linux\osinclude.h" />
@@ -403,4 +402,4 @@ cd %(RootDir)%(Directory)
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
\ No newline at end of file
+</Project>