Fixes to scanning:

- do version checking for the line-continuation character
 - check for built-in names in #undef
 - bug fix for #elif after #else
 - do version checking for use of floating point suffixes (f, LF, etc.)


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@24011 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/lineContinuation100.vert

@@ -0,0 +1,20 @@
+#version 100
+
+// this file cont\
+ains no errors other than the #error which are there to see if line numbering for errors is correct
+
+#error e1
+
+float f\
+oo;  // same as 'float foo;'
+
+#error e2
+
+#define MAIN void main() \
+{                        \
+gl_Position = vec4(foo); \
+} 
+
+#error e3
+
+MAIN