etc: Support local customizations in *.inc

This is useful for places, like hashbang.sh, which have site-specific
modifications of the *.inc files.

With the current setup, the package manager cannot automatically install
updated versions of those files, as it would need to somehow merge the
site-specific and upstream changes.  Having the site-specific changes in
separate files solves this.

etc/disable-common.inc

@@ -1,3 +1,6 @@
+# Local customizations come here
+include /etc/firejail/disable-common.local
+
 # History files in $HOME
 blacklist-nolog ${HOME}/.history
 blacklist-nolog ${HOME}/.*_history

etc/disable-common.local

@@ -0,0 +1 @@
+# This file is meant for local customizations of disable-common.local

etc/disable-devel.inc

@@ -1,3 +1,6 @@
+# Local customizations come here
+include /etc/firejail/disable-devel.local
+
 # development tools
 
 # GCC

etc/disable-devel.local

@@ -0,0 +1 @@
+# This file is meant for local customizations of disable-devel.local

etc/disable-passwdmgr.inc

@@ -1,3 +1,6 @@
+# Local customizations come here
+include /etc/firejail/disable-passwdmgr.local
+
 blacklist ${HOME}/.pki/nssdb
 blacklist ${HOME}/.lastpass
 blacklist ${HOME}/.keepassx

etc/disable-passwdmgr.local

@@ -0,0 +1 @@
+# This file is meant for local customizations of disable-passwdmgr.local

etc/disable-programs.inc

@@ -1,3 +1,6 @@
+# Local customizations come here
+include /etc/firejail/disable-programs.local
+
 blacklist ${HOME}/.*coin
 blacklist ${HOME}/.8pecxstudios
 blacklist ${HOME}/.Atom

etc/disable-programs.local

@@ -0,0 +1 @@
+# This file is meant for local customizations of disable-programs.local

etc/whitelist-common.inc

@@ -1,3 +1,6 @@
+# Local customizations come here
+include /etc/firejail/whitelist-common.local
+
 # common whitelist for all profiles
 
 whitelist ~/.XCompose

etc/whitelist-common.local

@@ -0,0 +1 @@
+# This file is meant for local customizations of whitelist-common.local