PR d/87799 Fix D build on windows hosts

PR d/87799
* d-system.h (_mkdir): Forward _mkdir on MinGW to mkdir in system.h.
* configure.ac: Remove d from unsupported languages on mingw and cygwin.
* configure: Regenerate.

From-SVN: r270349

ChangeLog

@@ -1,3 +1,8 @@
+2019-04-14  Johannes Pfau  <johannespfau@gmail.com>
+
+	* configure.ac: Remove d from unsupported languages on mingw and cygwin.
+	* configure: Regenerate.
+
 2019-04-14  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* configure.ac (enable_libphobos): Check LIBPHOBOS_SUPPORTED.

configure

@@ -3396,7 +3396,7 @@ case ,${enable_languages}, in
     ;;
   *)
     case "${target}" in
-      *-*-darwin* | *-*-cygwin* | *-*-mingw*)
+      *-*-darwin*)
 	unsupported_languages="$unsupported_languages d"
 	;;
     esac

configure.ac

@@ -681,7 +681,7 @@ case ,${enable_languages}, in
     ;;
   *)
     case "${target}" in
-      *-*-darwin* | *-*-cygwin* | *-*-mingw*)
+      *-*-darwin*)
 	unsupported_languages="$unsupported_languages d"
 	;;
     esac

gcc/d/ChangeLog

@@ -1,3 +1,7 @@
+2019-04-14  Johannes Pfau  <johannespfau@gmail.com>
+	PR d/87799
+	* d-system.h (_mkdir): Forward _mkdir on MinGW to mkdir in system.h.
+
 2019-04-12  Iain Buclaw  <ibuclaw@gdcproject.org>
 
 	* d-tree.h (DECL_IN_UNITTEST_CONDITION_P): Define.

gcc/d/d-system.h

@@ -55,4 +55,10 @@
 #undef tolower
 #define tolower(c) TOLOWER(c)
 
+/* Forward _mkdir on MinGW to mkdir in system.h.  */
+#ifdef _WIN32
+#undef _mkdir
+#define _mkdir(p) mkdir(p, 0)
+#endif
+
 #endif  /* GCC_D_SYSTEM_H  */