Add aliases to configure check for mingw cross compiler and dlltool.

diff --git a/configure b/configure
index 5680cfd..f3b3669 100755
--- a/configure
+++ b/configure
@@ -11978,7 +11978,7 @@
 
     if test "$cross_compiling" = "no"
     then
-      for ac_prog in i586-mingw32msvc-gcc
+      for ac_prog in i586-mingw32msvc-gcc i386-mingw32-gcc
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
@@ -12019,7 +12019,7 @@
 done
 test -n "$CROSSCC" || CROSSCC="false"
 
-      for ac_prog in i586-mingw32msvc-dlltool
+      for ac_prog in i586-mingw32msvc-dlltool i386-mingw32-dlltool
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2