various: remove GLEW compatibility workarounds

The restored EGL+GLX compatibility patch allows the default GLEW build to
support both EGL and GLX again.

Remove package specific overrides that forced `enableEGL = false`.

pkgs/by-name/me/meshlab/package.nix

@@ -76,12 +76,7 @@ stdenv.mkDerivation (finalAttrs: {
     bzip2
     muparser
     eigen
-    # MeshLab renders through Qt's xcb platform, which creates a GLX context,
-    # and calls glewInit() against it. The default EGL-enabled glew is built
-    # EGL-only (no GLX dispatch table), so glewInit can't read GL_VERSION and
-    # the app fails to launch with "GLEW initialization failed: Missing GL
-    # version". See https://github.com/NixOS/nixpkgs/issues/531470
-    (glew.override { enableEGL = false; })
+    glew
     gmp
     levmar
     qhull

pkgs/by-name/op/openscad/package.nix

@@ -127,9 +127,7 @@ stdenv.mkDerivation (finalAttrs: {
   buildInputs = [
     eigen
     boost
-    # OpenSCAD's GLX offscreen renderer needs GLEW's GLXEW symbols (`__GLXEW_SGIX_pbuffer`, `__GLXEW_SGIX_fbconfig`)
-    # which are not found in the default EGL-enabled glew and causes the build failure in https://github.com/NixOS/nixpkgs/issues/530529
-    (glew.override { enableEGL = false; })
+    glew
     opencsg
     cgal_5
     mpfr

pkgs/by-name/rp/rpcs3/package.nix

@@ -117,9 +117,7 @@ stdenv.mkDerivation (finalAttrs: {
     qtbase
     qtmultimedia
     openal
-    # RPCS3's X11 swap-interval path uses GLEW's GLXEW symbols, which
-    # are not provided in the default EGL-enabled GLEW build.
-    (glew.override { enableEGL = false; })
+    glew
     vulkan-headers
     vulkan-loader
     libpng