glcpp: Do not remove spaces to preserve locations.

After preprocessing by glcpp all adjacent spaces were replaced by
single one and glsl parser received column-shifted shader source.
It negatively affected ast location set up and produced wrong error
messages for heavily-spaced shaders.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/glsl/glcpp/glcpp-lex.l

@@ -338,7 +338,7 @@ HEXADECIMAL_INTEGER	0[xX][0-9a-fA-F]+[uU]?
 	return OTHER;
 }
 
-{HSPACE}+ {
+{HSPACE} {
 	if (yyextra->space_tokens) {
 		return SPACE;
 	}

src/glsl/glcpp/tests/000-content-with-spaces.c

@@ -1 +1 @@
-this is  four 	tokens
+   this is  four 	tokens  with spaces

src/glsl/glcpp/tests/000-content-with-spaces.c.expected

@@ -1,2 +1,2 @@
-this is four tokens
+   this is  four  tokens  with spaces
 

src/glsl/glcpp/tests/100-macro-with-colon.c.expected

@@ -2,7 +2,7 @@
 
 
 switch (1) {
- case 1 + 2:
- break;
+   case 1 + 2:
+      break;
 }