autoclean.sh: abide by POSIX shebang

Avoid non-POSIX brace expansion and rely on find to locate and destroy
files outside the root.

Signed-off-by: Dave Reisner <dreisner@archlinux.org>

autoclean.sh

@@ -1,9 +1,9 @@
 #!/bin/sh -xu
 
 [ -f Makefile ] && make distclean
+
 rm -rf autom4te.cache
-rm -f {Makefile.in,Makefile}
-rm -f {config.h.in,config.h}
+rm -f config.h.in config.h
 rm -f config.status
 rm -f configure
 rm -f stamp*
@@ -11,22 +11,12 @@ rm -f aclocal.m4
 rm -f compile
 rm -f libtool
 
-rm -f lib/libalpm/{Makefile.in,Makefile}
-rm -f src/util/{Makefile.in,Makefile}
-rm -f src/pacman/{Makefile.in,Makefile}
-rm -f scripts/{Makefile.in,Makefile}
-rm -f etc/{Makefile.in,Makefile}
-rm -f etc/pacman.d/{Makefile.in,Makefile}
-rm -f etc/abs/{Makefile.in,Makefile}
-rm -f test/{pacman,util}{,/tests}/{Makefile.in,Makefile}
-rm -f contrib/{Makefile.in,Makefile}
-rm -f doc/{Makefile.in,Makefile}
-
 rm -f test/pacman/*.pyc
 rm -f doc/html/*.html
 rm -f doc/man3/*.3
 
-rm -f {lib/libalpm,scripts,src/pacman}/po/{Makefile.in,Makefile}
-rm -f {lib/libalpm,scripts,src/pacman}/po/POTFILES
-rm -f {lib/libalpm,scripts,src/pacman}/po/stamp-po
-rm -f {lib/libalpm,scripts,src/pacman}/po/*.gmo
+find . \( -name 'Makefile' -o \
+          -name 'Makefile.in' -o \
+          -path '*/po/POTFILES' -o \
+          -path '*/po/stamp-po' -o \
+          -path '*/po/*.gmo' \) -exec rm -f {} +