Fix issue #62: emit stdlib code as char array, not a string

MSVC 2010 issues an error if given a string larger than 64k characters
long.  To work around this, the pre-processed stdlib.ispc code is now
stored as an array of characters terminated with a NUL (i.e. the same thing
in the end); MSVC is fine with arrays larger than 64k characters.

builtins.cpp

@@ -625,7 +625,7 @@ DefineStdlib(SymbolTable *symbolTable, llvm::LLVMContext *ctx, llvm::Module *mod
         // If the user wants the standard library to be included, parse the
         // serialized version of the stdlib.ispc file to get its definitions
         // added.
-        extern const char *stdlib_code;
+        extern char stdlib_code[];
         yy_scan_string(stdlib_code);
         yyparse();
     }

stdlib2cpp.py

@@ -2,10 +2,11 @@
 
 import sys
 
-print "const char *stdlib_code = "
-for line in sys.stdin:
-    l=line.rstrip()
-    l=l.replace('"', '\\"')
-    print "\"" + l + "\\n\""
+print "char stdlib_code[] = { "
 
-print ";"
+for line in sys.stdin:
+    for c in line:
+        print ord(c)
+        print ", "
+
+print "0 };"