opengl slide transitions not working with glm >= GLM 0.9.9.0

tracked it down to...

Removed default initialization, use GLM_FORCE_CTOR_INIT to restore the old behavior
so adding in GLM_FORCE_CTOR_INIT to get them working again

Change-Id: I1c6e7d8eb748fce40f0c518ff708708e5fb1e3d2
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/87791
Tested-by: Jenkins
Reviewed-by: Rene Engelhard <rene@debian.org>
Tested-by: Rene Engelhard <rene@debian.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/slideshow/Library_OGLTrans.mk b/slideshow/Library_OGLTrans.mk
index 4eca2a1..9b64181 100644
--- a/slideshow/Library_OGLTrans.mk
+++ b/slideshow/Library_OGLTrans.mk
@@ -17,6 +17,7 @@ endif

$(eval $(call gb_Library_add_defs,OGLTrans,\
    -DGLM_FORCE_RADIANS \
    -DGLM_FORCE_CTOR_INIT \
))

$(eval $(call gb_Library_use_sdk_api,OGLTrans))