all: update build scripts to fix AIX XL/C compatibility

src/cmd/mkfile

@@ -27,7 +27,7 @@ $PLAN9/bin/lex: $PLAN9/bin/yacc
 
 # This should not be necessary.
 $PLAN9/bin/yacc: $O.yacc
-	install -c $O.yacc $PLAN9/bin/yacc
+	$INSTALL -c $O.yacc $PLAN9/bin/yacc
 $O.yacc: yacc.$O
 	$LD -o $target $prereq
 yacc.$O: yacc.c

src/mk.AIX-power

@@ -0,0 +1,2 @@
+INSTALL=installbsd
+

src/mkmk.sh

@@ -211,5 +211,9 @@ echo cd `pwd`
 9c  word.c
 9c  unix.c
 9l -o o.mk arc.o archive.o bufblock.o env.o file.o graph.o job.o lex.o main.o match.o mk.o parse.o recipe.o rc.o rule.o run.o sh.o shell.o shprint.o symtab.o var.o varsub.o word.o unix.o 
-install o.mk $PLAN9/bin/mk
+if [ `uname` = AIX ]; then
+        installbsd o.mk $PLAN9/bin/mk
+else
+        install o.mk $PLAN9/bin/mk
+fi
 cd ..