qemu: Fix mingw builds

After the recent upgrade, mingw builds failed. Add a hack whilst a solution
is discussed upstream.

(From OE-Core rev: 967c6767eacab1951ae710666c588551102be5a3)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/qemu/qemu.inc

@@ -26,6 +26,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
            file://0010-configure-Add-pkg-config-handling-for-libgcrypt.patch \
            file://0001-Add-enable-disable-udev.patch \
            file://0001-qemu-Do-not-include-file-if-not-exists.patch \
+           file://mingwfix.patch \
            "
 UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"
 

meta/recipes-devtools/qemu/qemu/mingwfix.patch

@@ -0,0 +1,21 @@
+OE assumes that mingw files are in a unix like file layout. The
+'flattening' done by configure in qemu for mingw32 breaks things
+for us. We are discussing with upstream but for now, hack this to
+disable it and use the unix like layout everywhere.
+
+Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
+Upstream-Status: Submitted [https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg01073.html]
+
+Index: qemu-5.2.0/configure
+===================================================================
+--- qemu-5.2.0.orig/configure
++++ qemu-5.2.0/configure
+@@ -1541,7 +1541,7 @@ libdir="${libdir:-$prefix/lib}"
+ libexecdir="${libexecdir:-$prefix/libexec}"
+ includedir="${includedir:-$prefix/include}"
+ 
+-if test "$mingw32" = "yes" ; then
++if test "$mingw32" = "dontwantthis" ; then
+     mandir="$prefix"
+     datadir="$prefix"
+     docdir="$prefix"