RFR: JDK-8211724: Change mkdir -p to MakeDir macro where possible

[Erik Joelsson]

As a followup to JDK-8211677, here is an attempt at fixing most other 
instances of $(MKDIR) -p to instead of the MakeDir or MakeTargetDir 
macros. Since fixing the previous bug, we have hit the race in other 
recipes as well so this is really needed.

There are some situations where the macro would not apply, so those have 
been skipped. I'm also pretty sure that those are race free. See bug 
comment for details.

In addition to this I evaluated the AC_PROG_MKDIR_P macro. It didn't 
quite work out for us however. The fallback method if it cannot find a 
suitable mkdir binary is to use the build-aux/install.sh script. Our 
problem is that we have not included this script in our source (just a 
fake empty file) and to include it now would require a lot of legal 
work. What I've done instead is to simply add gmkdir first in the list 
of programs to look for when searching for mkdir. On Solaris, this is 
the program the macro found (and internally we have that installed on 
Solaris), so this will at least fix the immediate problem we are 
currently facing.

Bug: https://bugs.openjdk.java.net/browse/JDK-8211724

Webrev: http://cr.openjdk.java.net/~erikj/8211724/webrev.01/index.html

/Erik