libxbps: properly detect obsolete files with files being between pkgs.

120 test cases now successfully pass, and all known issues about
pkg updates that move files between them should be gone (hopefully).

tests/xbps/libxbps/shell/install_test.sh

@@ -315,7 +315,7 @@ update_file_timestamps_body() {
 
 	atf_check_equal "$expected" "$result"
 
-	sleep 2
+	sleep 1
 	cd repo
 	touch -f pkg_A/usr/include/gsm/gsm.h
 	xbps-create -A noarch -n foo-1.1_1 -s "foo pkg" ../pkg_A
@@ -386,6 +386,7 @@ update_move_file_body() {
 	xbps-rindex -d -a repo/*.xbps
 	atf_check_equal $? 0
 	xbps-install -r root --repository=repo -yvd A B
+	sleep 1
 	cd repo
 	rm ../pkg_B/usr/bin/sg
 	rm ../pkg_A/usr/bin/newgrp

tests/xbps/libxbps/shell/obsoletefiles_test.sh

@@ -212,7 +212,11 @@ files_move_to_dependency2_body() {
 	xbps-install -r root --repository=$PWD -yvd libressl
 	atf_check_equal $? 0
 
+	sleep 1
 	rm -f ../pkg_libressl/usr/lib/libcrypto.*
+	touch -f ../pkg_libcrypto/usr/lib/libcrypto.so.30
+	xbps-create -A noarch -n libcrypto-1.0_2 -s "libcrypto pkg" ../pkg_libcrypto
+	atf_check_equal $? 0
 	xbps-create -A noarch -n libressl-1.1_1 -s "libressl pkg" --dependencies "libcrypto>=1.0" ../pkg_libressl
 	atf_check_equal $? 0
 	xbps-rindex -d -a $PWD/*.xbps