[Bug build/30450] New: Build failure (linux-low.cc:5393:45: error: expected ':' before ')' token) with musl-1.2.4

["sam at gentoo dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30450

            Bug ID: 30450
           Summary: Build failure (linux-low.cc:5393:45: error: expected
                    ':' before ')' token) with musl-1.2.4
           Product: gdb
           Version: 13.1
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: sam at gentoo dot org
                CC: brobecke at sourceware dot org
  Target Milestone: ---

musl-1.2.4 drops LFS shims (see https://bugs.gentoo.org/903611#c0).

I get the following with musl-1.2.4:
```
[...]
x86_64-gentoo-linux-musl-g++     -I. -I. -I./../gdb/regformats -I./..
-I./../include -I./../gdb -I./../gnulib/import -I../gnulib/import -I./.. -I..  
-pthread -Wall -Wpointer-arith -Wno-unused -Wunused-value
-Wunused-variable -Wunused-function -Wno-switch -Wno-char-subscripts
-Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable
-Wno-sign-compare -Wno-error=maybe-uninitialized -Wno-mismatched-tags -Ws
uggest-override -Wimplicit-fallthrough=3 -Wduplicated-cond -Wshadow=local
-Wdeprecated-copy -Wdeprecated-copy-dtor -Wredundant-move
-Wmissing-declarations -Wstrict-null-sentinel -Wformat -Wformat-nonliteral
-DGDBSERVER -O2 -pipe -march=native -fdiagnostics-color=always
-frecord-gcc-switches -D_GLIBCXX_ASSERTIONS     -c -o linux-low.o -MT
linux-low.o -MMD -MP -MF ./.deps/linux-low.Tpo linux-low.cc
linux-low.cc: In function 'int proc_xfer_memory(CORE_ADDR, unsigned char*,
const gdb_byte*, int)':
linux-low.cc:5393:45: error: expected ':' before ')' token
 5393 |                  ? write (fd, writebuf, len));
      |                                             ^
      |                                             :
linux-low.cc:5393:45: error: expected primary-expression before ')' token
linux-low.cc:5393:45: error: expected ':' before ')' token
 5393 |                  ? write (fd, writebuf, len));
      |                                             ^
      |                                             :
linux-low.cc:5393:45: error: expected primary-expression before ')' token
make[2]: *** [Makefile:545: linux-low.o] Error 1
```

This is already fixed on master in
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=2e977d9901393ea1bacbe1896af0929e968bc811.

Could this be backported to the 13 branch? Thanks!

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