graphics/instant-meshes: include dirent.h instead of sys/dir.h which is scheduled for removal.

While here modernize USES

PR:		238620
Submitted by:	rene
Approved by:	Greg V (maintainer)
Event:		Berlin Hackathon 2019 (generating the patch)

graphics/instant-meshes/Makefile

@@ -17,7 +17,7 @@ LIB_DEPENDS=	libglfw.so:graphics/glfw \
 		libtbb.so:devel/tbb
 RUN_DEPENDS=	zenity:x11/zenity
 
-USES=		cmake compiler:c++14-lang eigen:3 localbase:ldflags pkgconfig
+USES=		cmake compiler:c++14-lang eigen:3 gl localbase:ldflags pkgconfig
 USE_GITHUB=	yes
 GH_ACCOUNT=	wjakob
 GH_TUPLE=	wjakob:nanogui:2a61f03:nanogui/ext/nanogui \

graphics/instant-meshes/files/patch-ext_nanogui_src_common.cpp

@@ -1,6 +1,15 @@
 --- ext/nanogui/src/common.cpp.orig	2016-10-15 20:12:12 UTC
 +++ ext/nanogui/src/common.cpp
-@@ -248,7 +248,7 @@ std::string file_dialog(const std::vecto
+@@ -24,7 +24,7 @@
+ #if !defined(_WIN32)
+     #include <locale.h>
+     #include <signal.h>
+-    #include <sys/dir.h>
++    #include <dirent.h>
+ #endif
+ 
+ NAMESPACE_BEGIN(nanogui)
+@@ -248,7 +248,7 @@ std::string file_dialog(const std::vector<std::pair<st
      return std::string(ofn.lpstrFile);
  #else
      char buffer[FILE_DIALOG_MAX_BUFFER];