[configs/*] Remove custom fstab, not needed anymore.

re-mount / as rw does not fail since regular file /etc/mtab does not exist
at that stage.

/etc/mtab was removed from root-image in this commit:
93763a2d82

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

configs/baseline/build.sh

@@ -16,14 +16,6 @@ make_basefs() {
     mkarchiso ${verbose} -D "${install_dir}" -p "syslinux" create "${work_dir}"
 }
 
-# Customize installation (root-image)
-make_customize_root_image() {
-    if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
-        cp -af root-image ${work_dir}
-        : > ${work_dir}/build.${FUNCNAME}
-    fi
-}
-
 # Copy mkinitcpio archiso hooks (root-image)
 make_setup_mkinitcpio() {
    if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
@@ -94,7 +86,6 @@ else
 fi
 
 make_basefs
-make_customize_root_image
 make_setup_mkinitcpio
 make_boot
 make_syslinux

configs/baseline/root-image/etc/fstab

@@ -1,2 +0,0 @@
-# <file system>        <dir>         <type>    <options>          <dump> <pass>
-/dev/mapper/root-image /             auto      defaults           0      0

configs/releng/root-image/etc/fstab

@@ -1,5 +0,0 @@
-#
-# /etc/fstab: static file system information
-#
-# <file system>        <dir>         <type>    <options>          <dump> <pass>
-/dev/mapper/root-image /             auto      defaults           0      0