Preprocessor: Fix array out of bounds bug in processing if-else-endif macros.

If we are not inside an if macro, we cannot simply decrease
elsetracker.

Fixes https://github.com/KhronosGroup/glslang/issues/29.

SPV: Declare MultiViewport capability.

Fix issue #191:
https://github.com/KhronosGroup/glslang/issues/191

SPV: Add support for memory qualifiers.

SPV: Support the new OpCode - OpImageSparseRead

Remove bison binary

SPV: Continue to fix the issue of bool -> uint32

Fix line endings in Test/100.conf

For short-circuit operator (&& and ||), the conversion is missing.

SPV: Fix an issue caused by bool-to-uint32 conversion.

Fix compilation issues with MSVC 2010

Minor warning fixes

Fix warnings/errors for strict aliasing & function prototypes

SPV: Ensure Parameterize is called during Disassemble

fix #171 - error: ‘isinf’ was not declared in this scope

This issue is related with the commit
103bef9d.

(mostly by eliminating use of range-based for loops and std::tie)

This fixes various issues related to gcc's strict-aliasing warning
by using unions. It also handles various cases hit with
gcc's missing-declarations warning.

glslang/MachineIndependent/intermOut.cpp used `isinf`,
but it's in `std` namespace, so should use `std::isinf`.

Error out if bison is not found on non-Windows operating systems.

We cannot just default to use tools/bison.exe when it is not on
Windows.