makepanda: Don't set HAVE_GLX in dtool_config.h

It's only used for disambiguation in pandagl.cxx, we don't need to expose this, and it should be possible to build pandagl.cxx without GLX

makepanda/makepanda.py

@@ -2521,7 +2521,6 @@ DTOOL_CONFIG=[
     ("REPORT_OPENSSL_ERRORS",          '1',                      '1'),
     ("USE_PANDAFILESTREAM",            '1',                      '1'),
     ("USE_DELETED_CHAIN",              '1',                      '1'),
-    ("HAVE_GLX",                       'UNDEF',                  '1'),
     ("HAVE_WGL",                       '1',                      'UNDEF'),
     ("HAVE_DX9",                       'UNDEF',                  'UNDEF'),
     ("HAVE_THREADS",                   '1',                      '1'),
@@ -2689,15 +2688,11 @@ def WriteConfigSettings():
         dtool_config["PHAVE_SYS_MALLOC_H"] = '1'
         dtool_config["HAVE_OPENAL_FRAMEWORK"] = '1'
         dtool_config["HAVE_X11"] = 'UNDEF'  # We might have X11, but we don't need it.
-        dtool_config["HAVE_GLX"] = 'UNDEF'
         dtool_config["IS_LINUX"] = 'UNDEF'
         dtool_config["HAVE_VIDEO4LINUX"] = 'UNDEF'
         dtool_config["PHAVE_LINUX_INPUT_H"] = 'UNDEF'
         dtool_config["IS_OSX"] = '1'
 
-    if PkgSkip("X11"):
-        dtool_config["HAVE_GLX"] = 'UNDEF'
-
     if (GetTarget() == "freebsd"):
         dtool_config["IS_LINUX"] = 'UNDEF'
         dtool_config["HAVE_VIDEO4LINUX"] = 'UNDEF'
@@ -5084,9 +5079,10 @@ if (GetTarget() not in ['windows', 'darwin'] and PkgSkip("X11")==0 and not RUNTI
 #
 
 if (GetTarget() not in ['windows', 'darwin'] and PkgSkip("GL")==0 and PkgSkip("X11")==0 and not RUNTIME):
-  OPTS=['DIR:panda/src/glxdisplay', 'BUILDING:PANDAGL',  'GL', 'NVIDIACG', 'CGGL']
+  DefSymbol('GLX', 'HAVE_GLX', '')
+  OPTS=['DIR:panda/src/glxdisplay', 'BUILDING:PANDAGL', 'GL', 'NVIDIACG', 'CGGL', 'GLX']
   TargetAdd('p3glxdisplay_composite1.obj', opts=OPTS, input='p3glxdisplay_composite1.cxx')
-  OPTS=['DIR:panda/metalibs/pandagl', 'BUILDING:PANDAGL',  'GL', 'NVIDIACG', 'CGGL']
+  OPTS=['DIR:panda/metalibs/pandagl', 'BUILDING:PANDAGL', 'GL', 'NVIDIACG', 'CGGL', 'GLX']
   TargetAdd('pandagl_pandagl.obj', opts=OPTS, input='pandagl.cxx')
   TargetAdd('libpandagl.dll', input='p3x11display_composite1.obj')
   TargetAdd('libpandagl.dll', input='pandagl_pandagl.obj')