platforms: Add Miyoo target

Based on existing OpenDingux targets, just built for arm32.

.gitlab-ci.yml

@@ -100,6 +100,10 @@ include:
   - project: 'libretro-infrastructure/ci-templates'
     file: '/dingux-mips32.yml'
 
+  # OpenDingux (ARM)
+  - project: 'libretro-infrastructure/ci-templates'
+    file: '/dingux-arm32.yml'
+
   # tvOS (AppleTV)
   - project: 'libretro-infrastructure/ci-templates'
     file: '/tvos-arm64.yml'
@@ -284,6 +288,12 @@ libretro-build-retrofw-mips32:
     - .libretro-retrofw-mips32-make-default
     - .core-defs
 
+# Miyoo
+libretro-build-miyoo-arm32:
+  extends:
+    - .libretro-miyoo-arm32-make-default
+    - .core-defs
+
 #################################### MISC ##################################
 # Emscripten
 libretro-build-emscripten:

Makefile.libretro

@@ -450,6 +450,17 @@ else ifeq ($(platform), retrofw)
 	PLATFORM_DEFINES += -ffast-math -march=mips32 -mtune=mips32 -mhard-float -fomit-frame-pointer
 	EXTERNAL_ZLIB = 1
 
+# Miyoo
+else ifeq ($(platform), miyoo)
+	TARGET := $(TARGET_NAME)_libretro.so
+	CC = /opt/miyoo/usr/bin/arm-linux-gcc
+	CXX = /opt/miyoo/usr/bin/arm-linux-g++
+	AR = /opt/miyoo/usr/bin/arm-linux-ar
+	fpic := -fPIC
+	SHARED := -shared -Wl,--version-script=src/drivers/libretro/link.T -Wl,-no-undefined
+	PLATFORM_DEFINES += -fomit-frame-pointer -ffast-math -mcpu=arm926ej-s
+	EXTERNAL_ZLIB = 1
+
 # Windows MSVC 2017 all architectures
 else ifneq (,$(findstring windows_msvc2017,$(platform)))
 	CC  = cl.exe