vulkan: Update all components to Vulkan SDK 1.3.261.1

Updates to volk, vulkan headers, `vk_enum_string_helper.h`, VMA,
glslang, spirv-reflect.

VMA doesn't tag SDK releases specifically, and still hasn't had a tagged
release since 3.0.1, but the Vulkan SDK now seems to ship a recent master
commit, so we do the same.

thirdparty/glslang/SPIRV/SpvPostProcess.cpp

@@ -57,7 +57,6 @@ namespace spv {
 
 namespace spv {
 
-#ifndef GLSLANG_WEB
 // Hook to visit each operand type and result type of an instruction.
 // Will be called multiple times for one instruction, once for each typed
 // operand and the result.
@@ -334,7 +333,6 @@ void Builder::postProcess(Instruction& inst)
         }
     }
 }
-#endif
 
 // comment in header
 void Builder::postProcessCFG()
@@ -395,7 +393,6 @@ void Builder::postProcessCFG()
         decorations.end());
 }
 
-#ifndef GLSLANG_WEB
 // comment in header
 void Builder::postProcessFeatures() {
     // Add per-instruction capabilities, extensions, etc.,
@@ -483,14 +480,11 @@ void Builder::postProcessFeatures() {
         }
     }
 }
-#endif
 
 // comment in header
 void Builder::postProcess() {
   postProcessCFG();
-#ifndef GLSLANG_WEB
   postProcessFeatures();
-#endif
 }
 
 }; // end spv namespace