Clarified that GNU sort isn't required, we just need the -V option to be supported

(cherry-picked from commit f687cbd4c6)

configure

@@ -17952,8 +17952,8 @@ test -n "$SORT" || SORT="false"
 
 if ! "$SORT" -V </dev/null >/dev/null
 then :
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: GNU sort(1) is required to find dynamic libraries" >&5
-printf "%s\n" "$as_me: WARNING: GNU sort(1) is required to find dynamic libraries" >&2;}
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: sort(1) that supports the -V option is required to find dynamic libraries" >&5
+printf "%s\n" "$as_me: WARNING: sort(1) that supports the -V option is required to find dynamic libraries" >&2;}
 fi
 
 # Check whether --enable-largefile was given.

configure.ac

@@ -71,7 +71,7 @@ if [ test -z "$AWK" ]; then
 fi
 
 AC_CHECK_PROGS([SORT], [gsort sort], [false])
-AS_IF([! "$SORT" -V </dev/null >/dev/null], [AC_MSG_WARN([GNU sort(1) is required to find dynamic libraries])])
+AS_IF([! "$SORT" -V </dev/null >/dev/null], [AC_MSG_WARN([sort(1) that supports the -V option is required to find dynamic libraries])])
 
 dnl 64-bit file offsets if possible unless --disable-largefile is specified
 AC_SYS_LARGEFILE