tccpp : "tcc -E -P" : suppress empty lines

Also:
- regenerate all tests/pp/*.expect with gcc
- test "insert one space" feature
- test "0x1E-1" in asm mode case
- PARSE_FLAG_SPACES: ignore \f\v\r better
- tcc.h: move some things

tests/tcctest.c

@@ -2573,6 +2573,10 @@ void asm_test(void)
 {
     char buf[128];
     unsigned int val;
+
+    printf("inline asm:\n");
+
+    // parse 0x1E-1 as 3 tokens in asm mode
     asm volatile ("mov $0x1E-1,%eax");
 
     /* test the no operand case */