Small fix: make istext static

This takes away a build failure in some cases.

Reviewed-by: Tim Hudson <tjh@openssl.org>

apps/apps.c

diff --git a/apps/apps.c b/apps/apps.c
index d4af862..5c36a37 100644
--- a/apps/apps.c
+++ b/apps/apps.c
@@ -2721,7 +2721,7 @@
  * does impact behavior on some platform, such as differentiating between
  * text and binary input/output on non-Unix platforms
  */
-inline int istext(int format)
+static int istext(int format)
 {
     return (format & B_FORMAT_TEXT) == B_FORMAT_TEXT;
 }