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[11] Use generic errstr.go implementation on musl

Sören Tempel requested to merge nmeum/alpine-gcc-patches:alpine/11-libgo-errstr into alpine/11

glibc provides two version of strerror_r() depending on a feature test macro. The first is the XSI-compliant version which returns an int, the second is GNU-specific and returns a char pointer.

Similarity, gcc's libgo provides two implementations of Errstr() both of which use strerror_r(). On Linux, it is assumed that the GNU-specific strerror_r version is used. However, musl only provides the XSI-compliant version of strerror_r. This patch enables the generic Errstr() implementation which also uses the XSI-compliant version of strerror_r.

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