tools/cmake: update to 3.8.1

* update cmake to 3.8.1
* refresh patches

Release notes:
https://cmake.org/cmake/help/v3.8/release/3.8.html

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

tools/cmake/patches/150-bootstrap_parallel_make_flag.patch

@@ -1,6 +1,6 @@
 --- a/bootstrap
 +++ b/bootstrap
-@@ -958,7 +958,10 @@ int main(){ printf("1%c", (char)0x0a); r
+@@ -1046,7 +1046,10 @@ int main(){ printf("1%c", (char)0x0a); r
  ' > "test.c"
  cmake_original_make_flags="${cmake_make_flags}"
  if [ "x${cmake_parallel_make}" != "x" ]; then