[gdb] Fix -Wstrict-null-sentinel warnings
When passed in CXXFLAGS, -Wstrict-null-sentinel triggers twice in a
gdb/gdbserver build.
Fix the two occurrences.
Build and reg-tested on x86_64-linux.
gdb/ChangeLog:
2020-02-10 Tom de Vries <tdevries@suse.de>
* dwarf2/read.c (process_psymtab_comp_unit_reader): Cast concat NULL
sentinel to char *.
gdbsupport/ChangeLog:
2020-02-10 Tom de Vries <tdevries@suse.de>
* environ.c (gdb_environ::set): Cast concat NULL sentinel to char *.
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