Update libbase64.

libbase64/config.sh

@@ -12,7 +12,7 @@ OPSYS=$(uname -s)
 
 echo "Configuring for ${OPSYS}..."
 if [ "x${OPSYS}" = "xLinux" ]; then
-    OS_CFLAGS="-D_BSD_SOURCE -D_POSIX_SOURCE -D_XOPEN_SOURCE"
+    OS_CFLAGS="-D_DEFAULT_SOURCE -D_POSIX_SOURCE -D_XOPEN_SOURCE"
 else
     OS_CFLAGS=""
 fi
@@ -25,7 +25,7 @@ fi
 
 if [ -z "${PREFIX}" ]; then
     PREFIX="/usr/local"
-fi    
+fi
 
 if [ "${PREFIX}" = "/usr" ]; then
     MANDIR="$(PREFIX)/share/man"