Web: Turn off includes, independent preprocessing path, fine tune all.

Saved about 21K, size down to 380K of MSVC x86 code.
Fixed one bug that needs to be looked at on the master branch:
The test for needing a Vulkan binding has a bug in it, "!layoutAttachment"
which does not mean "no layoutAttachment", because that is non-zero.
This is why some test and test results changed.

glslang/MachineIndependent/SymbolTable.h

@@ -116,8 +116,11 @@ public:
     }
     virtual int getNumExtensions() const { return extensions == nullptr ? 0 : (int)extensions->size(); }
     virtual const char** getExtensions() const { return extensions->data(); }
+
+#ifndef GLSLANG_WEB
     virtual void dump(TInfoSink& infoSink, bool complete = false) const = 0;
     void dumpExtensions(TInfoSink& infoSink) const;
+#endif
 
     virtual bool isReadOnly() const { return ! writable; }
     virtual void makeReadOnly() { writable = false; }
@@ -193,7 +196,9 @@ public:
     }
     virtual const char** getMemberExtensions(int member) const { return (*memberExtensions)[member].data(); }
 
+#ifndef GLSLANG_WEB
     virtual void dump(TInfoSink& infoSink, bool complete = false) const;
+#endif
 
 protected:
     explicit TVariable(const TVariable&);
@@ -314,7 +319,9 @@ public:
     virtual TParameter& operator[](int i) { assert(writable); return parameters[i]; }
     virtual const TParameter& operator[](int i) const { return parameters[i]; }
 
+#ifndef GLSLANG_WEB
     virtual void dump(TInfoSink& infoSink, bool complete = false) const override;
+#endif
 
 protected:
     explicit TFunction(const TFunction&);
@@ -374,7 +381,9 @@ public:
     virtual const char** getExtensions() const override { return anonContainer.getMemberExtensions(memberNumber); }
 
     virtual int getAnonId() const { return anonId; }
+#ifndef GLSLANG_WEB
     virtual void dump(TInfoSink& infoSink, bool complete = false) const override;
+#endif
 
 protected:
     explicit TAnonMember(const TAnonMember&);
@@ -542,7 +551,9 @@ public:
 
     void relateToOperator(const char* name, TOperator op);
     void setFunctionExtensions(const char* name, int num, const char* const extensions[]);
+#ifndef GLSLANG_WEB
     void dump(TInfoSink& infoSink, bool complete = false) const;
+#endif
     TSymbolTableLevel* clone() const;
     void readOnly();
 
@@ -843,7 +854,9 @@ public:
     }
 
     int getMaxSymbolId() { return uniqueId; }
+#ifndef GLSLANG_WEB
     void dump(TInfoSink& infoSink, bool complete = false) const;
+#endif
     void copyTable(const TSymbolTable& copyOf);
 
     void setPreviousDefaultPrecisions(TPrecisionQualifier *p) { table[currentLevel()]->setPreviousDefaultPrecisions(p); }