configure: opengl overhaul

Rename config option from "glx" to "opengl", glx will not be the only
option for opengl in near future.  Also switch over to pkg-config for
opengl support detection.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/vl.c b/vl.c
index eba5d4c..694deb4 100644
--- a/vl.c
+++ b/vl.c
@@ -130,6 +130,7 @@ static int data_dir_idx;
 const char *bios_name = NULL;
 enum vga_retrace_method vga_retrace_method = VGA_RETRACE_DUMB;
 DisplayType display_type = DT_DEFAULT;
+int display_opengl;
 static int display_remote;
 const char* keyboard_layout = NULL;
 ram_addr_t ram_size;