BOARD: separate miyoo packages + concentrate RetroArch/libretro (#129)

MENU->Target packages ---> Miyoo Packages ---> ...

package/miyoo/retroarch/libretro-gpsp/0001-optimize-flags.patch

@@ -0,0 +1,40 @@
+diff --git a/Makefile b/Makefile
+index 5a3bab75..f67efe1e 100644
+--- a/Makefile
++++ b/Makefile
+@@ -2,6 +2,7 @@ DEBUG=0
+ FRONTEND_SUPPORTS_RGB565=1
+ FORCE_32BIT_ARCH=0
+ MMAP_JIT_CACHE=0
++PROFILE ?= 0
+ 
+ UNAME=$(shell uname -a)
+ 
+@@ -482,11 +483,26 @@ else ifeq ($(platform), miyoo)
+ 	CXX = /opt/miyoo/usr/bin/arm-linux-g++
+ 	AR = /opt/miyoo/usr/bin/arm-linux-ar
+ 	SHARED := -shared -nostdlib -Wl,--version-script=link.T
+-	fpic := -fPIC -DPIC
++	fpic := -fno-PIC
+ 	CFLAGS += -fomit-frame-pointer -ffast-math -march=armv5te -mtune=arm926ej-s
+ 	CFLAGS += -DSMALL_TRANSLATION_CACHE
+ 	HAVE_DYNAREC := 1
+ 	CPU_ARCH := arm
++	CFLAGS += -Ofast \
++	-flto=4 -fwhole-program -fuse-linker-plugin \
++	-fdata-sections -ffunction-sections -Wl,--gc-sections \
++	-fno-stack-protector -fno-ident -fomit-frame-pointer \
++	-fno-unroll-loops \
++	-marm
++ifeq ($(PROFILE), YES)
++	CFLAGS += -fprofile-generate=$(HOMEPATH)/profile # rm path if you want dir structure intact at runtime
++	LDFLAGS += -lgcov
++else ifeq ($(PROFILE), APPLY)
++        CFLAGS += -fprofile-use -fbranch-probabilities -Wno-error=coverage-mismatch
++endif
++	ASFLAGS += $(CFLAGS)
++	ARCH = arm
++	MMAP_JIT_CACHE = 1
+ 
+ # Windows
+ else