Fix last __has_include update

After this last change the radare2 project did not compile anymore.

Start with BOL flag after include ends in tccpp.c.
Update testcase 18.

tccpp.c

@@ -2633,7 +2633,8 @@ static inline void next_nomacro1(void)
                 s1->include_stack_ptr--;
                 p = file->buf_ptr;
                 if (p == file->buffer)
-                    tok_flags = TOK_FLAG_BOF|TOK_FLAG_BOL;
+                    tok_flags = TOK_FLAG_BOF;
+                tok_flags |= TOK_FLAG_BOL;
                 goto redo_no_start;
             }
         } else {

tests/tests2/18_include.c

@@ -4,6 +4,7 @@ int main()
 {
    printf("including\n");
 #include "18_include.h"
+#define  test_missing_nl
    printf("done\n");
 
 #define  INC   "18_include.h"

tests/tests2/18_include.h

@@ -1 +1,5 @@
 printf("included\n");
+/* test file with missing newline */
+#ifndef INCLUDE
+#define INCLUDE
+#endif /* INCLUDE */