[PATCH 2/2] AC_SITE_LOAD: append '.exe' to ac_executable_extensions on OS/2

Codes searching for the executables uses '' and
$ac_executable_extensions as extensions of the executables. But it is
used without any initializing. That is, it is an empty string by
default. As a result, without appending '.exe' to it on OS/2,
searching for the executables fails on OS/2.

* lib/autoconf/general.m4 (AC_SITE_LOAD): Append '.exe' to
ac_executable_extensions if it does not contain '.exe' on OS/2.
---
 lib/autoconf/general.m4 | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/autoconf/general.m4 b/lib/autoconf/general.m4
index 6173b83..d4a05e3 100644
--- a/lib/autoconf/general.m4
+++ b/lib/autoconf/general.m4
@@ -1959,6 +1959,15 @@ if test -n "$OS2_SHELL"; then
   # This strange code is necessary to deal with handling of backslashes by
   # ksh.
   export PATH=$(expr "$PATH" | tr '\\' /)
+
+  # Append .exe to ac_executable_extensions if it does not contain .exe
+  for ac_exec_ext in $ac_executable_extensions
+  do
+    test "$ac_exec_ext" = ".exe" && break
+  done
+  if test "$ac_exec_ext" != ".exe"; then
+    ac_executable_extensions="$ac_executable_extensions .exe"
+  fi
 fi
 ])
 
-- 
1.9.5