Update SPIRV libraries (#99)

* Update SPIRV libraries

- Update `spirv-cross`
- Update `spirv-tools`
- Update `glslang`

`spirv-tools` contains a fix for an issue we reported (unnecessary promotions to highp in certain expressions).

* Add SPIRV-Tools dependency to matinfo

third_party/spirv-tools/source/util/string_utils.cpp

@@ -16,7 +16,7 @@
 #include <cstdint>
 #include <type_traits>
 
-#include "util/string_utils.h"
+#include "source/util/string_utils.h"
 
 namespace spvtools {
 namespace utils {