egl: drop incorrect pkg-config file for glvnd

With b01524fff0 ("meson: don't build libGLES*.so with GLVND")
we dropped the incorrect pkg-config files for GLES*.

Since then, the glvnd issue of its missing files has become painfully
apparent, since it break the build for everyone using glvnd.

NVIDIA has had a fix for a few years now, but has yet to accept it:
https://github.com/NVIDIA/libglvnd/pull/86

Since the breakage is already there, let's clean up everything on our side
while we wait for NVIDIA to accept the fix.

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>

src/egl/meson.build

@@ -172,26 +172,18 @@ libegl = shared_library(
   version : egl_lib_version,
 )
 
-# If using glvnd the pkg-config header should not point to EGL_mesa, it should
-# point to EGL. glvnd is only available on unix like platforms so adding -l
-# should be safe here
-# TODO: in the glvnd case glvnd itself should really be providing this.
-if with_glvnd
-  _egl = '-L${libdir} -lEGL'
-else
-  _egl = libegl
+if not with_glvnd
+  pkg.generate(
+    name : 'egl',
+    description : 'Mesa EGL Library',
+    version : meson.project_version(),
+    libraries : libegl,
+    libraries_private: gl_priv_libs,
+    requires_private : gl_priv_reqs,
+    extra_cflags : gl_pkgconfig_c_flags,
+  )
 endif
 
-pkg.generate(
-  name : 'egl',
-  description : 'Mesa EGL Library',
-  version : meson.project_version(),
-  libraries : _egl,
-  libraries_private: gl_priv_libs,
-  requires_private : gl_priv_reqs,
-  extra_cflags : gl_pkgconfig_c_flags,
-)
-
 if with_tests and prog_nm.found()
   if with_glvnd
     egl_symbols = files('egl-glvnd-symbols.txt')