linuxPackages.nvidia_x11: install libraries with correct sonames

Use the real soname from the library to determine where to link it,
and use a symlink structure that does not make ldconfig explode.

pkgs/os-specific/linux/nvidia-x11/builder.sh

@@ -185,20 +185,27 @@ installPhase() {
         patchelf --set-rpath "$out/lib:$libPath" "$libname"
       fi
 
-      libname_short=`echo -n "$libname" | sed 's/so\..*/so/'`
+      # Manually create the right symlinks for the libraries.
+      #
+      # We can't just use ldconfig, because it does not create libfoo.so symlinks,
+      # only libfoo.so.1.
+      # Also, the symlink chain must be libfoo.so -> libfoo.so.1 -> libfoo.so.123.45,
+      # or ldconfig will explode.
+      # See: https://github.com/bminor/glibc/blob/6f3f6c506cdaf981a4374f1f12863b98ac7fea1a/elf/ldconfig.c#L854-L877
 
-      if [[ "$libname" != "$libname_short" ]]; then
-        ln -srnf "$libname" "$libname_short"
-      fi
+      libbase=$(basename "$libname")
+      libdir=$(dirname "$libname")
+      soname=$(patchelf --print-soname "$libname")
+      unversioned=${libbase/\.so\.[0-9\.]*/.so}
 
-      if [[ $libname_short =~ libEGL.so || $libname_short =~ libEGL_nvidia.so || $libname_short =~ libGLX.so || $libname_short =~ libGLX_nvidia.so ]]; then
-          major=0
-      else
-          major=1
-      fi
+      if [[ -n "$soname" ]]; then
+        if [[ "$soname" != "$libbase" ]]; then
+          ln -s "$libbase" "$libdir/$soname"
+        fi
 
-      if [[ "$libname" != "$libname_short.$major" ]]; then
-        ln -srnf "$libname" "$libname_short.$major"
+        if [[ "$soname" != "$unversioned" ]]; then
+          ln -s "$soname" "$libdir/$unversioned"
+        fi
       fi
     done