Fix some "is not defined" warnings.

chalk/plugins/filters/cimg/CImg.h

@@ -4059,7 +4059,7 @@ namespace cimg_library {
 	  XSendEvent(cimg::X11attr().display, window, False, 0, &event);
 	  pthread_mutex_unlock(cimg::X11attr().mutex);
 	} else {
-#if cimg_use_xshm
+#ifdef cimg_use_xshm
 	  if (shminfo)
 	    XShmPutImage(cimg::X11attr().display,window,*cimg::X11attr().gc,image,0,0,0,0,width,height,False);
 	  else
@@ -4157,7 +4157,7 @@ namespace cimg_library {
       if (fullscreen) XUngrabKeyboard(cimg::X11attr().display,CurrentTime);
       XDestroyWindow(cimg::X11attr().display,window);
       if (shminfo) {
-#if cimg_use_xshm
+#ifdef cimg_use_xshm
 	XShmDetach(cimg::X11attr().display, shminfo);
 	XDestroyImage(image);
 	shmdt(shminfo->shmaddr);

kexi/kexidb/parser/sqlparser.cpp

@@ -942,7 +942,7 @@ typedef short int yytype_int16;
 #define YYSIZE_MAXIMUM ((YYSIZE_T) -1)
 
 #ifndef YY_
-# if YYENABLE_NLS
+# ifdef YYENABLE_NLS
 #  if ENABLE_NLS
 #   include <libintl.h> /* INFRINGES ON USER NAME SPACE */
 #   define YY_(msgid) dgettext ("bison-runtime", msgid)
@@ -1663,7 +1663,7 @@ while (YYID (0))
    we won't break user code: when these are the locations we know.  */
 
 #ifndef YY_LOCATION_PRINT
-# if YYLTYPE_IS_TRIVIAL
+# ifdef YYLTYPE_IS_TRIVIAL
 #  define YY_LOCATION_PRINT(File, Loc)			\
      fprintf (File, "%d.%d-%d.%d",			\
 	      (Loc).first_line, (Loc).first_column,	\

kexi/kexidb/parser/sqlscanner.cpp

@@ -554,7 +554,7 @@ static int input YY_PROTO(( void ));
 #endif
 #endif
 
-#if YY_STACK_USED
+#ifdef YY_STACK_USED
 static int yy_start_stack_ptr = 0;
 static int yy_start_stack_depth = 0;
 static int *yy_start_stack = 0;
@@ -1738,10 +1738,10 @@ FILE *file;
 	b->yy_input_file = file;
 	b->yy_fill_buffer = 1;
 
-#if YY_ALWAYS_INTERACTIVE
+#ifdef YY_ALWAYS_INTERACTIVE
 	b->yy_is_interactive = 1;
 #else
-#if YY_NEVER_INTERACTIVE
+#ifdef YY_NEVER_INTERACTIVE
 	b->yy_is_interactive = 0;
 #else
 	b->yy_is_interactive = file ? (isatty( fileno(file) ) > 0) : 0;
@@ -2032,7 +2032,7 @@ void *ptr;
 	free( ptr );
 	}
 
-#if YY_MAIN
+#ifdef YY_MAIN
 int main()
 	{
 	yylex();