Cygwin: Adjust mklib so -linker and -cplusplus options are processed more like they are for linux

It looks like we were ignoring -linker when -noprefix wasn't present, and
when -noprefix was present, -linker was mandatory and -cplusplus ignored.

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Signed-off-by: Brian Paul <brianp@vmware.com>

bin/mklib

@@ -930,6 +930,16 @@ case $ARCH in
 
      CYGWIN*)
 	# GCC-based environment
+
+	if [ "x$LINK" = "x" ] ; then
+	    # -linker was not specified so set default link command now
+            if [ $CPLUSPLUS = 1 ] ; then
+                LINK=g++
+            else
+                LINK=gcc
+            fi
+	fi
+
 	if [ $NOPREFIX = 1 ] ; then
 	    # No "lib" or ".so" part
 	    echo "mklib: Making CYGWIN shared library: " ${LIBNAME}
@@ -966,12 +976,6 @@ case $ARCH in
             fi
             echo "mklib: Making CYGWIN shared library: " ${CYGNAME}-${MAJOR}.dll
 
-            if [ $CPLUSPLUS = 1 ] ; then
-                LINK="g++"
-            else
-                LINK="gcc"
-            fi
-
             # rm any old libs
             rm -f ${CYGNAME}-${MAJOR}.dll
             rm -f ${LIBNAME}-${MAJOR}.dll.a