[build-scripts] be more robust about startup directory

build-scripts/rebuild-nqp-rx.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+cd
 set -e
 echo -e "\n\nNew nqp-rx build"
 date

build-scripts/rebuild-partcl-nqp.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+cd
 PATH=/usr/local/bin:/usr/bin:/bin:/usr/games
 echo
 echo "updating partcl-nqp"

build-scripts/rebuild-rakudo.pl

@@ -2,9 +2,11 @@
 use warnings;
 use File::Path qw(rmtree);
 use 5.010;
-#use autodie;
+use autodie;
 use Data::Dumper;
 
+chdir glob '~';
+
 my $home = glob('~') . '/';
 my @dirs = qw(p1 p2);
 my %swap = (@dirs, reverse(@dirs));