tools-hardened/desktop: Adds KERNEL_DIR env var to emerge calls

It is important that when emerging packages no kernel configuration
is taken from the running kernel, to fix this all calls to emerge
have been prepended with the KERNEL_DIR env var which includes the
kernel src dir that emerge should look at inside the chroot.

tools-hardened/desktop/rebuild.sh

@@ -1,5 +1,7 @@
 #!/bin/bash -l
 
+kernel_dir="/usr/src/linux-tinhat"
+
 source /etc/profile
 env-update
-emerge -evq --keep-going --with-bdeps=y world
+KERNEL_DIR="${kernel_dir}" emerge -evq --keep-going --with-bdeps=y world

tools-hardened/desktop/toolchain.sh

@@ -1,11 +1,13 @@
 #!/bin/bash -l
 
+kernel_dir="/usr/src/linux-tinhat"
+
 source /etc/profile
 env-update
-emerge -1q binutils
+KERNEL_DIR="${kernel_dir}" emerge -1q binutils
 source /etc/profile
 env-update
-emerge -1q gcc
+KERNEL_DIR="${kernel_dir}" emerge -1q gcc
 source /etc/profile
 env-update
-emerge -1q glibc
+KERNEL_DIR="${kernel_dir}" emerge -1q glibc

tools-hardened/desktop/update.sh

@@ -1,5 +1,6 @@
 #!/bin/bash -l
 
+kernel_dir="/usr/src/linux-tinhat"
 #Right now we're commenting out the cairo
 #rebuild to see if it works in glibc.
 #hacky - for some reason cairo fails to rebuild
@@ -12,4 +13,4 @@ env-update
 #env-update
 #emerge -1q x11-libs/cairo
 
-emerge -uvNDq --keep-going --with-bdeps=y world
+KERNEL_DIR="${kernel_dir}" emerge -uvNDq --keep-going --with-bdeps=y world