Update glslang to 11.1.0 (#1662)

* Update glslang to 11.1.0

This change pulls new versions of glslang, spirv-headers, and spirv-tools as submodules, and makes the necessary changes to other files in the repository to get it all building (at least on Windows).

This change also enables building of glslang from source by default, so that we can easily generate new binaries for inclusion in the `slang-binaries` repository.

* fixup: missing file

1 files changed, 3 insertions, 1 deletions

diff --git a/premake5.lua b/premake5.lua
index 211955ae1..3d925ddb8 100644
--- a/premake5.lua
+++ b/premake5.lua
@@ -79,7 +79,7 @@ newoption {
    trigger     = "build-glslang",
    description = "(Optional) If true glslang and spirv-opt will be built",
    value       = "bool",
-   default     = "false",
+   default     = "true",
    allowed     = { { "true", "True"}, { "false", "False" } }
 }
 
@@ -1311,9 +1311,11 @@ standardProject("slang-glslang", "source/slang-glslang")
         -- On Windows we need to add the platform-specific sources and then
         -- remove the `main.cpp` file since it tries to define a `DllMain`
         -- and we don't want the default glslang one.
+        addSourceDir( "external/glslang/glslang/OSDependent/Windows")
         removefiles { "external/glslang/glslang/OSDependent/Windows/main.cpp" }
 
     filter { "system:linux or macosx" }
+        addSourceDir( "external/glslang/glslang/OSDependent/Unix")
         links { "dl" }