cleanup - use guile's C interface to load modules when in C context

That should be slightly more efficient than having it first
parse a string.

gnucash/gnome-utils/gncmod-gnome-utils.c

@@ -56,22 +56,14 @@ libgncmod_gnome_utils_gnc_module_description(void)
     return g_strdup("Utilities for using Gnome/Gtk with GnuCash");
 }
 
-static void
-lmod(char * mn)
-{
-    char * form = g_strdup_printf("(use-modules %s)\n", mn);
-    scm_c_eval_string(form);
-    g_free(form);
-}
-
 extern SCM scm_init_sw_gnome_utils_module(void);
 
 int
 libgncmod_gnome_utils_gnc_module_init(int refcount)
 {
     scm_init_sw_gnome_utils_module();
-    lmod("(sw_gnome_utils)");
-    lmod("(gnucash gnome-utils)");
+    scm_c_use_module ("sw_gnome_utils");
+    scm_c_use_module("gnucash gnome-utils");
 
     /* Initialize the options-ui database */
     if (refcount == 0)

gnucash/html/gncmod-html.c

@@ -60,23 +60,14 @@ libgncmod_html_gnc_module_description( void )
     return g_strdup( "Utilities for using HTML with GnuCash" );
 }
 
-static void
-lmod( char* mn )
-{
-    char* form = g_strdup_printf( "(use-modules %s)\n", mn );
-    scm_c_eval_string( form );
-    g_free( form );
-}
-
 extern SCM scm_init_sw_gnc_html_module( void );
 
 int
 libgncmod_html_gnc_module_init( int refcount )
 {
     scm_init_sw_gnc_html_module();
     gnc_html_initialize();
-    lmod( "(sw_gnc_html)" );
-//	lmod( "(gnucash gnc_html)" );
+    scm_c_use_module( "sw_gnc_html" );
 
     return TRUE;
 }

gnucash/import-export/qif-imp/gncmod-qif-import.c

@@ -76,7 +76,7 @@ libgncmod_qif_import_gnc_module_init(int refcount)
         ((void (*)())gnc_file_qif_import);
     }
 
-    scm_c_eval_string("(use-modules (gnucash qif-import))");
+    scm_c_use_module("gnucash qif-import");
 
     gnc_plugin_qif_import_create_plugin();
 

gnucash/report/gncmod-report.c

@@ -62,7 +62,7 @@ libgncmod_report_gnc_module_init(int refcount)
 {
     scm_init_sw_report_module();
 
-    scm_c_eval_string("(use-modules (gnucash report))");
+    scm_c_use_module ("gnucash report");
 
     /* if this is the first time the module's being loaded, initialize
      * the relative date system */