configure chmod 755 etc.

lib/tcov.c:
- can't be cross-compiled (needs stdio.h)
- can be included in libtcc1.a

Reason why bt-xxx.o/bcheck.o are linked separatly is because we
don't want then to linked into exe's and dlls at the same time.

tests/tests2/96_nodata_wanted.c

@@ -58,7 +58,11 @@ ts1:;
         void *p = (void*)&main;
         char cc[] = "static string";
         double d = 8.0;
-        struct __attribute__((packed)) {
+        struct
+#ifndef __arm__
+        __attribute__((packed))
+#endif
+        {
             unsigned x : 12;
             unsigned char y : 7;
             unsigned z : 28, a: 4, b: 5;