[Bug #1923] use AS_MKDIR_P and @MKDIR_P@ instead of $as_mkdir_p

Bug #1923: use AS_MKDIR_P and @MKDIR_P@ instead of $as_mkdir_p
http://redmine.ruby-lang.org/issues/show/1923

e$B5/I<<Te(B: Kazuhiro NISHIYAMA
e$B%9%F!<%?%9e(B: Open, e$BM%@hEYe(B: Normal
ruby -v: ruby 1.9.2dev (2009-08-07 trunk 24440) [i686-linux]

Debian sid
e$B$G%S%k%I$7$?$H$-$K%S%k%I%G%#%l%/%H%j$K!Ve(B"$as_dir"e$B!W$H$$$&%G%#%l%/%H%j$,=PMh$F$$$F!"D4$Y$F$_$k$He(B
autoconf e$B$,e(B 2.64-1
e$B$K$J$C$F!Ve(B$as_mkdir_pe$B!W$NDj5A$,JQ$o$C$?$+$i$@$H$o$+$j$^$7$?!#e(B

Debian BTS e$B$KJs9p$7$F$_$?$H$3$me(B(
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=540233 )e$B!“$=$l$Oe(B
Ruby e$B$N%P%0$Ge(B $as_mkdir_p e$B$G$O$J$/e(B AS_MKDIR_P e$B$de(B
@MKDIR_P@ e$B$r;H$&$h$&$K!”$H$$$&46$8$NJV;v$,JV$C$F$-$^$7$?!#e(B

e$B%A%1%C%He(B #1923 e$B$,99?7$5$l$^$7$?!#e(B (by Yui NARUSE)

e$B%9%F!<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B

r39026e$B$K$F=$@5$5$l$F$$$^$9e(B

http://redmine.ruby-lang.org/issues/show/1923