add missing check from autoconf-archive (used by new version of

ax_check_gl.m4)

[[Imported from SVN: r2401]]

m4/ax_lang_compiler_ms.m4

+dnl Available from the GNU Autoconf Macro Archive at:
+dnl http://www.gnu.org/software/ac-archive/htmldoc/ax_lang_compiler_ms.html
+dnl
+AC_DEFUN([AX_LANG_COMPILER_MS],
+[AC_CACHE_CHECK([whether we are using the Microsoft _AC_LANG compiler],
+                [ax_cv_[]_AC_LANG_ABBREV[]_compiler_ms],
+[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[#ifndef _MSC_VER
+       choke me
+#endif
+]])],
+                   [ax_compiler_ms=yes],
+                   [ax_compiler_ms=no])
+ax_cv_[]_AC_LANG_ABBREV[]_compiler_ms=$ax_compiler_ms
+])])