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.

Test/spv.hlslOffsets.vert

@@ -1,6 +1,6 @@
 #version 450
 
-buffer block {
+layout(binding = 0) buffer block {
     float m0;
     vec3 m4;
     //////