[gimp/wip/Jehan/native-win64-build] Try to build exactly like MSYS2.

[Jehan <jehanp src gnome org>]

commit e70e3c241c6a7cb181cf3a486e1d15c54b98e6cd
Author: Jehan <jehan girinstud io>
Date:   Mon May 3 21:14:04 2021 +0200

    Try to build exactly like MSYS2.
    
    Cf. https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-babl/PKGBUILD

 build/windows/build-msys2.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/build/windows/build-msys2.sh b/build/windows/build-msys2.sh
index 60dd59e84a..5b10daf3d2 100644
--- a/build/windows/build-msys2.sh
+++ b/build/windows/build-msys2.sh
@@ -100,13 +100,13 @@ git clone --depth=${GIT_DEPTH} https://gitlab.gnome.org/GNOME/gegl.git _gegl
 mkdir _babl/_build
 cd _babl/_build
 git apply ../../build/windows/patches/0001-Introspection-in-verbose-mode.patch
-meson -Dprefix="${GIMP_PREFIX}" -Dwith-docs=false ..
+meson --prefix="${GIMP_PREFIX}" -Dwith-docs=false --buildtype=plain -Dwith-lcms=true Denable-gir=true ..
 ninja -v
 ninja install
 
 mkdir ../../_gegl/_build
 cd ../../_gegl/_build
-meson -Dprefix="${GIMP_PREFIX}" -Ddocs=false ..
+meson --prefix="${GIMP_PREFIX}" -Ddocs=false ..
 ninja
 ninja install
 cd ../..