Change library loading algorithm.

If the environment variable LD_LIBRARY_PATH is set, the loadable modules
are first looked up in the directories listed in that variable, and then
in the extension installation directory. Two attempts are made for each
directory: first the library name with the -v-VERSION suffix is tried,
then the library name without that suffix.

* src: Rename to gamma
* Makefile.am (SUBDIRS): Update.
* configure.ac: Update.
* scripts/bootstrap (srcdir, makefile): Update.

* gamma/loader.sci: New file.
* gamma/Makefile.am: Build loader.scm

* src/sql.sci: Remove.
* gamma/sql.scm: New file.
* modules/sql (scm): Update.

* src/syslog.sci: Remove.
* gamma/syslog.scm: New file.
* modules/syslog (scm): Update.

* src/expat.sci: Remove.
* gamma/expat.scm: New file.
* modules/expat (scm): Update.

1 files changed, 3 insertions, 3 deletions

diff --git a/scripts/bootstrap b/scripts/bootstrap
index b1b990f..5d9d3eb 100755
--- a/scripts/bootstrap
+++ b/scripts/bootstrap
@@ -4,7 +4,7 @@ main='(module-ref (resolve-module '\''(scripts bootstrap)) '\'main')'
 exec ${GUILE-guile} -l $0 -c "(apply $main (cons \"$0\" (cdr (command-line))))" "$@"
 !#
 ;;;; This file is part of Gamma.
-;;;; Copyright (C) 2010, 2015 Sergey Poznyakoff
+;;;; Copyright (C) 2010-2018 Sergey Poznyakoff
 ;;;;
 ;;;; Gamma is free software; you can redistribute it and/or modify
 ;;;; it under the terms of the GNU General Public License as published by
@@ -31,8 +31,8 @@ exec ${GUILE-guile} -l $0 -c "(apply $main (cons \"$0\" (cdr (command-line))))"
 (debug-enable 'backtrace)
 
 (define module-dir #f)
-(define srcdir "src")
-(define makefile "src/modules.mk")
+(define srcdir "gamma")
+(define makefile "gamma/modules.mk")
 (define modconfig-file "m4/modules.m4")
 (define modconfig-defun "gamma_MODCONFIG")
 (define autogenerated-file-header