Ticket History #8880: Fix Linux build error with musl libc

Fix typo in musl build fix

Commit cbdbc8d00d31344fafe00e0fdf984e04e631f7c4 checked for
__GLIBC__PREREQ instead of __GLIBC_PREREQ, thus accidentally reverting
the workaround introduced in commit
bf5953c549a6d279977df69ffe89b2ba51460eaf. Fix the typo.

https://github.com/krb5/krb5/commit/b009cca2026b615ef5386faa4c0230bc27c4161d
Author: Greg Hudson <ghudson@mit.edu>
Commit: b009cca2026b615ef5386faa4c0230bc27c4161d
Branch: master
src/util/support/plugins.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

Fix Linux build error with musl libc

Commit bf5953c549a6d279977df69ffe89b2ba51460eaf caused a build failure
on non-glibc Linux build environments. Change the conditionalization
so that __GLIBC_PREREQ will only be used if it is defined.

[ghudson@mit.edu: simplified conditionals; rewrote commit message]

(cherry picked from commit cbdbc8d00d31344fafe00e0fdf984e04e631f7c4)

https://github.com/krb5/krb5/commit/062dbfaa9c66d29bca3e7071fcaba336172987b9
Author: TBK <tbk@jjtc.eu>
Committer: Greg Hudson <ghudson@mit.edu>
Commit: 062dbfaa9c66d29bca3e7071fcaba336172987b9
Branch: krb5-1.18
src/util/support/plugins.c | 3 +--
1 files changed, 1 insertions(+), 2 deletions(-)