libblastrampoline_jll: Run __init__ eagerly

This allows LBT to be used during a sysimage (`--trim`) build.

Author: topolarity

stdlib/libblastrampoline_jll/src/libblastrampoline_jll.jl

@@ -57,9 +57,17 @@ function __init__()
     global libblastrampoline_path = string(libblastrampoline.path)
     global artifact_dir = dirname(Sys.BINDIR)
     LIBPATH[] = dirname(libblastrampoline_path)
+    empty!(LIBPATH_list)
     push!(LIBPATH_list, LIBPATH[])
 end
 
+# Running this __init__() eagerly initializes several of the above global
+# with build-time values (which are not correct to use at run-time), but
+# thankfully these will be reset by __init__() before they are used.
+#
+# This allows BLAS / LinearAlgebra to be used in a sysimage (`--trim`) build.
+__init__()
+
 if Base.generating_output()
     precompile(eager_mode, ())
     precompile(is_available, ())