fix r3822 Solaris strerror() invalid error code behaviour depends on version: Solaris 10 returns "Unknown error" and sets errno to EINVAL, Solaris 9 returns "Unknown error" and leaves errno intact, Solaris 2 returns NULL.

# Copyright (C) Igor Sysoev


# aCC: HP ANSI C++ B3910B A.03.55.02

# C89 mode

CFLAGS="$CFLAGS -Ae"
CC_TEST_FLAGS="-Ae"

PCRE_OPT="$PCRE_OPT -Ae"
ZLIB_OPT="$ZLIB_OPT -Ae"
MD5_OPT="$MD5_OPT -Ae"