Recommended update for trustedgrub2

This update for trustedgrub2 provides the following fixes:

- Fix "no symbol table" error on new binutils. (bsc#1100984)
- Fix packed-not-aligned error on GCC 8. (bsc#1084632)
- Allow to execute menuentry unrestricted as default. (fate#318574, bsc#1052420)
- Disable PIE building, as it does not make sense for bootloader.

This update was imported from the SUSE:SLE-12-SP2:Update update project.

Fixed bugs
bnc#1084632
GCC 8: grub2 build fails
bnc#1100984
Grub 2 stops complains about "no symbol table" but after pressing enter just proceeds as normal
bnc#1052420
Secure Grub does not honor settings made in yast about "secure grub" / password protected grub and asks for password at every boot
Selected Binaries
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