Require glib2 2.68 or later (for g_memdup2) (#400)

.github/workflows/build.yml

@@ -125,7 +125,7 @@ jobs:
             base-devel
             gcc
             git
-            glib2
+            glib2-devel
       - uses: actions/checkout@v2
       - name: Check out test data
         run: git clone https://github.com/mdbtools/mdbtestdata.git test

configure.ac

@@ -226,10 +226,9 @@ AC_ARG_ENABLE(glib,
 
 if test "$enable_glib" = "yes"; then
     GLIB_PACKAGE=glib-2.0
-    PKG_CHECK_MODULES([GLIB], [$GLIB_PACKAGE], HAVE_GLIB=true, HAVE_GLIB=false)
+    PKG_CHECK_MODULES([GLIB], [$GLIB_PACKAGE >= 2.68], HAVE_GLIB=true, HAVE_GLIB=false)
     if test "x$HAVE_GLIB" = "xtrue"; then
         GLIB_CFLAGS="$GLIB_CFLAGS -DHAVE_GLIB=1"
-        AC_CHECK_LIB($GLIB_PACKAGE, g_memdup2, [GLIB_CFLAGS="$GLIB_CFLAGS -DHAVE_G_MEMDUP2=1"])
         AC_SUBST(GLIB_PACKAGE)
     else
         enable_glib=no

include/mdbfakeglib.h

@@ -117,6 +117,7 @@ typedef struct GOptionContext {
 #define g_malloc malloc
 #define g_free free
 #define g_realloc realloc
+#define g_memdup2 g_memdup
 
 #define	G_STR_DELIMITERS "_-|> <."
 

include/mdbprivate.h

@@ -26,10 +26,6 @@
  * used within mdbtools so they won't be exported to calling programs.
  */
 
-#ifndef HAVE_G_MEMDUP2
-#define g_memdup2 g_memdup
-#endif
-
 #ifdef __cplusplus
   extern "C" {
 #endif