Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1197

Fix the following musl build failure on mips:

```
In file included from /nvmedata/autobuild/instance-15/output-1/build/libabseil-cpp-20211102.0/absl/base/internal/low_level_alloc.cc:26:
/nvmedata/autobuild/instance-15/output-1/build/libabseil-cpp-20211102.0/absl/base/internal/direct_mmap.h:49:10: fatal error: sgidefs.h: No such file or directory
   49 | #include <sgidefs.h>
      |          ^~~~~~~~~~~
```

Fixes:
 - http://autobuild.buildroot.org/results/3fa027e602bacb22316fb5d9b233baa0b0f0e845

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Merge c9b5b5c5471213a871f7d6d1d2fc8f6899effbac into a184bab8

Merging this change closes #1197

COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1197 from ffontaine:master c9b5b5c5471213a871f7d6d1d2fc8f6899effbac
PiperOrigin-RevId: 455467767
Change-Id: I1905f7d70e914288bc1524a52adce3476a779fd8