use single-file port for libretro.h

Ref #60

lib/import/import-libretro.mk

@@ -1,5 +1,5 @@
-RETROARCH_PORT_DIR := $(call select_from_ports,retroarch)
+LIBRETRO_PORT_DIR := $(call select_from_ports,libretro)
 
-INC_DIR += $(RETROARCH_PORT_DIR)/include/libretro
+INC_DIR += $(LIBRETRO_PORT_DIR)/include
 
 SYMBOLS = $(REP_DIR)/lib/symbols/libretro

ports/libretro.hash

@@ -0,0 +1 @@
+4af697b4dcae97201f56baf817497595df9ae3b4

ports/libretro.port

@@ -0,0 +1,9 @@
+LICENSE   := MIT
+VERSION   := 1.3.6
+DOWNLOADS := libretro.file
+
+URL(libretro) := https://raw.githubusercontent.com/libretro/RetroArch/v1.3.6/libretro-common/include/libretro.h
+SHA(libretro) := 452485de627b9791b243a628c1ec3f6b8a90d2c0
+
+DIRS := include
+DIR_CONTENT(include) := libretro.h

ports/retroarch.hash

@@ -1 +0,0 @@
-d124c14fc2233d88289e1eee584d8789f4fe299f

ports/retroarch.port

@@ -1,10 +0,0 @@
-LICENSE   := GPL3
-VERSION   := 1.3.2
-DOWNLOADS := retroarch.archive
- 
-URL(retroarch) := https://github.com/libretro/RetroArch/archive/v$(VERSION).tar.gz
-SHA(retroarch) := 0e88126e9193949f65ed2b48cd2a13e2327b08b6
-DIR(retroarch) := src/app/retroarch
-
-DIRS := include/libretro
-DIR_CONTENT(include/libretro) := src/app/retroarch/libretro.h

src/app/retro_frontend/target.mk

@@ -1,3 +1,9 @@
 TARGET = retro_frontend
 SRC_CC = component.cc
-LIBS   = base libretro libc file
+LIBS   = base libc
+
+LIBRETRO_INC := $(call select_from_ports,libretro)/include
+
+INC_DIR += $(LIBRETRO_INC)
+
+component.cc: $(LIBRETRO_INC)/libretro.h