regex: port Gnulib code to z/OS POSIX environment

Problem reported by Arnold Robbins in: https://lists.gnu.org/r/bug-gnulib/2018-08/msg00129.html * posix/regex_internal.h (__iswalnum, __towlower, __towupper) [!_LIBC]: Undef.
lattera · Aug 23, 2018 · b35d350 · b35d350
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diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,11 @@
+2018-08-22  Paul Eggert  <[email protected]>
+
+	regex: port Gnulib code to z/OS POSIX environment
+	Problem reported by Arnold Robbins in:
+	https://lists.gnu.org/r/bug-gnulib/2018-08/msg00129.html
+	* posix/regex_internal.h (__iswalnum, __towlower, __towupper) [!_LIBC]:
+	Undef.
+
 2018-08-22  Joseph Myers  <[email protected]>
 
 	* math/test-double-vlen2.h: Don't include <math-tests-rounding.h>.

diff --git a/posix/regex_internal.h b/posix/regex_internal.h
@@ -149,7 +149,10 @@
 /* Rename to standard API for using out of glibc.  */
 #ifndef _LIBC
 # undef __wctype
+# undef __iswalnum
 # undef __iswctype
+# undef __towlower
+# undef __towupper
 # define __wctype wctype
 # define __iswalnum iswalnum
 # define __iswctype iswctype