toolchain: Bump everything to pull in required SPIR-V tools revision

Encompasses pull request #261 from Chris.

Also gets things building again reflecting upstream changesi, mainly
HLSL libs for glslang.

Desktop build/test results w/ update_external_sources.sh/bat
 Windows on Skylake: _run_all_tests.ps1, demos with --validate
 Ubuntu on Skylake: vk_layer_validation_tests, cube --validate

Android build/test results w/ update_external_sources_android.sh/bat:
 Windows: VkLayerValidationTests pass
 OSX: VkLayerValidationTests pass
 Ubuntu: VkLayerValidationTests pass
diff --git a/glslang_revision b/glslang_revision
index 4722425..56c5bed 100644
--- a/glslang_revision
+++ b/glslang_revision
@@ -1 +1 @@
-c3869fee412a90c4eadea0bf936ab2530d2dff51
+d99524197f3b68dbd6267bd3f4d7e8a0f49167b4