Restore warning message about bison expected output.
Restore warning message about bison expected output.

It was dropped in ad9593f229362782b953da4b805df713e8468df0.

Signed-off-by: Jon Loeliger <2c20cf3f4bac0d9467d3fe2c932e4d1e1bc1f44c@jdl.com>

jbott/lk_gee,M1cha/mi2_lk,RonGokhale/android_lk_bootloader,M1cha/android_bootable_bootloader_lk,oubeichen/lk-v500,mozilla-b2g/kernel_lk,chirayudesai/android_bootable_bootloader_lk,Redmi-dev/android_bootable_lk,CanarySolutions/little-kernel,M1cha/lktris,jsr-d9/android_kernel_lk,MiCode/mi2_lk,RonGokhale/android_lk_bootloader,t2m-foxfone/android_kernel_lk,M1cha/lktris,Foxda-Tech/argo8-bootable-bootloader-lk,Blefish/android_bootable_bootloader_lk,DooMLoRD/android_bootable_bootloader_lk,oubeichen/lk-v500,Foxda-Tech/polaris-bootable-bootloader-lk,zhuotong/mi2_lk_NoEmmc,jsr-d10/android_bootable_bootloader_lk,t2m-foxfone/android_kernel_lk,Redmi-dev/android_bootable_lk,Blefish/android_bootable_bootloader_lk,jbott/lk_gee,MiCode/mi2_lk,DooMLoRD/android_bootable_bootloader_lk,t2m-foxfone/android_kernel_lk,detule/lk-g2-spr,oubeichen/lk-v500,utilite2/lk,CanarySolutions/little-kernel,efidroid/lk,M1cha/mi2_lk,Foxda-Tech/argo8-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,chirayudesai/android_bootable_bootloader_lk,jsr-d10/android_bootable_bootloader_lk,zhuotong/mi2_lk_NoEmmc,pichina/lk,pichina/lk,t2m-foxfone/kernel_lk,efidroid/lk,thornbirdblue/codeaurora_lk,oubeichen/lk-v500,efidroid/lk,Redmi-dev/android_bootable_lk,M1cha/lktris,DooMLoRD/android_bootable_bootloader_lk,jsr-d9/android_kernel_lk,M1cha/android_bootable_bootloader_lk,Foxda-Tech/polaris-bootable-bootloader-lk,zhuotong/mi2_lk_NoEmmc,jsr-d10/android_bootable_bootloader_lk,M1cha/lktris,M1cha/mi2_lk,mozilla-b2g/kernel_lk,DooMLoRD/android_bootable_bootloader_lk,t2m-foxfone/kernel_lk,hanjae/lumiab0,M1cha/android_bootable_bootloader_lk,Redmi-dev/android_bootable_lk,lg-devs/g2-bootloader,detule/lk-g2-spr,mozilla-b2g/fairphone2_kernel_lk,MiCode/mi2_lk,chirayudesai/android_bootable_bootloader_lk,mozilla-b2g/fairphone2_kernel_lk,jsr-d10/android_bootable_bootloader_lk,pichina/lk,jsr-d9/android_kernel_lk,hanjae/lumiab0,mozilla-b2g/kernel_lk,M1cha/android_bootable_bootloader_lk,DooMLoRD/android_bootable_bootloader_lk,Blefish/android_bootable_bootloader_lk,hanjae/lumiab0,M1cha/mi2_lk,jbott/lk_gee,utilite2/lk,oubeichen/lk-v500,hanjae/lumiab0,M1cha/android_bootable_bootloader_lk,Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/argo8-bootable-bootloader-lk,mozilla-b2g/fairphone2_kernel_lk,M1cha/android_bootable_bootloader_lk,pichina/lk,CanarySolutions/little-kernel,mozilla-b2g/fairphone2_kernel_lk,jsr-d9/android_kernel_lk,Foxda-Tech/polaris-bootable-bootloader-lk,MiCode/mi2_lk,lg-devs/g2-bootloader,chirayudesai/android_bootable_bootloader_lk,idor/dk50-bootable_bootloader_lk,hanjae/lumiab0,thornbirdblue/codeaurora_lk,t2m-foxfone/android_kernel_lk,utilite2/lk,pichina/lk,utilite2/lk,zhuotong/mi2_lk_NoEmmc,t2m-foxfone/kernel_lk,utilite2/lk,RonGokhale/android_lk_bootloader,jbott/lk_gee,M1cha/mi2_lk,Redmi-dev/android_bootable_lk,detule/lk-g2-spr,Foxda-Tech/argo8-bootable-bootloader-lk,jsr-d10/android_bootable_bootloader_lk,efidroid/lk,thornbirdblue/codeaurora_lk,Blefish/android_bootable_bootloader_lk,RonGokhale/android_lk_bootloader,CanarySolutions/little-kernel,t2m-foxfone/android_kernel_lk,t2m-foxfone/kernel_lk,idor/dk50-bootable_bootloader_lk,RonGokhale/android_lk_bootloader,detule/lk-g2-spr,efidroid/lk,Blefish/android_bootable_bootloader_lk,Foxda-Tech/argo8-bootable-bootloader-lk,mozilla-b2g/kernel_lk,thornbirdblue/codeaurora_lk,lg-devs/g2-bootloader,thornbirdblue/codeaurora_lk,mozilla-b2g/kernel_lk,chirayudesai/android_bootable_bootloader_lk,lg-devs/g2-bootloader,idor/dk50-bootable_bootloader_lk,lg-devs/g2-bootloader,idor/dk50-bootable_bootloader_lk,M1cha/lktris,jbott/lk_gee,CanarySolutions/little-kernel,idor/dk50-bootable_bootloader_lk,detule/lk-g2-spr,t2m-foxfone/kernel_lk,zhuotong/mi2_lk_NoEmmc,mozilla-b2g/fairphone2_kernel_lk,jsr-d9/android_kernel_lk,MiCode/mi2_lk