Solve Mac 10.10.5 fluid build errors (#1245)

fluid/Project.cxx

@@ -14,6 +14,7 @@
 //     https://www.fltk.org/bugs.php
 //
 
+#include <errno.h>	// strerror(errno)
 #include "Project.h"
 
 #include "io/String_Writer.h"

fluid/app/templates.cxx

@@ -13,7 +13,7 @@
 //
 //     https://www.fltk.org/bugs.php
 //
-
+#include <errno.h>		// strerror(errno)
 #include "app/templates.h"
 
 #include "Fluid.h"

fluid/panels/codeview_panel.cxx

@@ -16,6 +16,7 @@
 
 // generated by Fast Light User Interface Designer (fluid) version 1.0500
 
+#include <stdlib.h>	// malloc()
 #include "codeview_panel.h"
 #include "Fluid.h"
 #include "Project.h"

fluid/panels/widget_panel.cxx

@@ -16,6 +16,7 @@
 
 // generated by Fast Light User Interface Designer (fluid) version 1.0500
 
+#include <stdlib.h>	// free()
 #include "widget_panel.h"
 #include "Fluid.h"
 #include "app/Snap_Action.h"

fluid/widgets/Code_Editor.cxx

@@ -20,6 +20,7 @@
 // Include necessary headers...
 //
 
+#include <stdlib.h>
 #include "widgets/Code_Editor.h"
 
 using namespace fld;