Recommended update for gcc7

gcc7 was updated to the GCC 7.4 release.

Other bugfixes:

- Fix AVR configuration to not use __cxa_atexit or libstdc++ headers.
Point to /usr/avr/sys-root/include as system header include directory.
- Includes fix for build with ISL 0.20.
- Pulls fix for libcpp lexing bug on ppc64le manifesting during build with gcc8. [bsc#1099119]
- Pulls fix for forcing compile-time tuning even when building with -march=z13 on s390x. [bsc#1099192]
- Fixes support for 32bit ASAN with glibc 2.27+

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

Fixed bugs
bnc#1099192
SLES 12 SP3 Toolchain Module - TCM GCC (7.3.1) creates slow executables when compiling with -march=z13 (performance)
bnc#1099119
cross-ppc64-gcc7 and others build failed in OBS for TW ppc64le
Selected Binaries
cpp7 cpp7-debuginfo gcc7 gcc7-32bit gcc7-ada gcc7-ada-32bit gcc7-ada-debuginfo gcc7-c++ gcc7-c++-32bit gcc7-c++-debuginfo gcc7-debuginfo gcc7-debugsource gcc7-fortran gcc7-fortran-32bit gcc7-fortran-debuginfo gcc7-go gcc7-go-32bit gcc7-go-debuginfo gcc7-info gcc7-locale libada7 libada7-32bit libada7-32bit-debuginfo libada7-debuginfo libasan4 libasan4-32bit libasan4-32bit-debuginfo libasan4-debuginfo libcilkrts5 libcilkrts5-32bit libcilkrts5-32bit-debuginfo libcilkrts5-debuginfo libgfortran4 libgfortran4-32bit libgfortran4-32bit-debuginfo libgfortran4-debuginfo libgo11 libgo11-32bit libgo11-32bit-debuginfo libgo11-debuginfo libstdc++6-devel-gcc7 libstdc++6-devel-gcc7-32bit libubsan0 libubsan0-32bit libubsan0-32bit-debuginfo libubsan0-debuginfo
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