Recommended update for gcc7

This update for gcc7 fixes the following issues:

- Fixed webkit2gtk3 build (bsc#1181618)
- Change GCC exception licenses to SPDX format
- Remove include-fixed/pthread.h

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
bnc#1181618
gcc ICE on building webkit2gtk3 for Leap 15.3
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 gcc7-objc gcc7-obj-c++ gcc7-obj-c++-32bit gcc7-objc-32bit gcc7-obj-c++-debuginfo gcc7-objc-debuginfo 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 libobjc4 libobjc4-32bit libobjc4-32bit-debuginfo libobjc4-debuginfo libubsan0 libubsan0-32bit libubsan0-32bit-debuginfo libubsan0-debuginfo libstdc++6-devel-gcc7 libstdc++6-devel-gcc7-32bit
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