Don't link module LIBS to jimsh/libjim

Some libraries are only required for specific dynamic modules, so don't
include them when linking jimsh or libjim.so

Reported-by: Stuart Cassoff
Signed-off-by: Steve Bennett <steveb@workware.net.au>

autosetup/local.tcl

@@ -55,6 +55,9 @@ proc check-extension-status {ext required} {
 
     array set depinfo {m 0 y 0 n 0}
 
+    # Stash the current value of LIBS
+    set LIBS [get-define LIBS]
+
     # Check direct dependencies
     if [ext-get $ext check 1] {
         # "check" conditions are met
@@ -63,6 +66,12 @@ proc check-extension-status {ext required} {
         incr depinfo(n)
     }
 
+    if {$ext in $withinfo(mod)} {
+        # This is a module, so ignore LIBS
+        # LDLIBS_$ext will contain the appropriate libs for this module
+        define LIBS $LIBS
+    }
+
     if {$depinfo(n) == 0} {
         # Now extension dependencies
         foreach i [ext-get $ext dep] {