Remove GLSLANG_WEB and GLSLANG_WEB_DEVEL

This CL removes the GLSLANG_WEB and GLSLANG_WEB_DEVEL
cmake build options and their usage in the codebase.

Issue #2958

glslang/MachineIndependent/preprocessor/PpTokens.cpp

@@ -113,7 +113,6 @@ int TPpContext::TokenStream::getToken(TParseContextBase& parseContext, TPpToken
     int atom = stream[currentPos++].get(*ppToken);
     ppToken->loc = parseContext.getCurrentLoc();
 
-#ifndef GLSLANG_WEB
     // Check for ##, unless the current # is the last character
     if (atom == '#') {
         if (peekToken('#')) {
@@ -123,7 +122,6 @@ int TPpContext::TokenStream::getToken(TParseContextBase& parseContext, TPpToken
             atom = PpAtomPaste;
         }
     }
-#endif
 
     return atom;
 }