Add static linking support

Makefile.libretro

+STATIC_LINKING=0
+
 ifeq ($(platform),)
 platform = unix
 ifeq ($(shell uname -a),)
@@ -38,23 +40,30 @@ else
 endif
 endif
 
+ifeq ($(STATIC_LINKING),1)
+	EXT=a
+endif
+
 ifeq ($(platform), unix)
-   TARGET := $(TARGET_NAME)_libretro.so
+	EXT?=so
+   TARGET := $(TARGET_NAME)_libretro.$(EXT)
    fpic := -fPIC
    SHARED := -shared -Wl,--no-undefined
 else ifeq ($(platform), linux-portable)
-   TARGET := $(TARGET_NAME)_libretro.so
+	EXT?=so
+   TARGET := $(TARGET_NAME)_libretro.$(EXT)
    fpic := -fPIC -nostdlib
    SHARED := -shared -Wl,--no-undefined
 	LIBM :=
 else ifeq ($(platform), osx)
-   TARGET := $(TARGET_NAME)_libretro.dylib
+	EXT?=dylib
+   TARGET := $(TARGET_NAME)_libretro.$(EXT)
    fpic := -fPIC
    SHARED := -dynamiclib
 # iOS
 else ifneq (,$(findstring ios,$(platform)))
-
-   TARGET := $(TARGET_NAME)_libretro_ios.dylib
+	EXT?=dylib
+   TARGET := $(TARGET_NAME)_libretro_ios.$(EXT)
    fpic := -fPIC
    SHARED := -dynamiclib
    DEFINES := -DIOS
@@ -81,16 +90,19 @@ include $(THEOS)/makefiles/common.mk
 
 LIBRARY_NAME = $(TARGET_NAME)_libretro_ios
 else ifeq ($(platform), qnx)
-	TARGET := $(TARGET_NAME)_libretro_qnx.so
+	EXT?=so
+	TARGET := $(TARGET_NAME)_libretro_qnx.$(EXT)
    fpic := -fPIC
    SHARED := -shared -Wl,--no-undefined
 else ifeq ($(platform), emscripten)
-   TARGET := $(TARGET_NAME)_libretro_emscripten.so
+	EXT?=bc
+   TARGET := $(TARGET_NAME)_libretro_emscripten.$(EXT)
    fpic := -fPIC
    SHARED := -shared -Wl,--no-undefined
 # PS3
 else ifeq ($(platform), ps3)
-	TARGET := $(TARGET_NAME)_libretro_ps3.a
+	EXT=a
+	TARGET := $(TARGET_NAME)_libretro_ps3.$(EXT)
 	CC = $(CELL_SDK)/host-win32/ppu/bin/ppu-lv2-gcc.exe
 	CC_AS = $(CELL_SDK)/host-win32/ppu/bin/ppu-lv2-gcc.exe
 	AR = $(CELL_SDK)/host-win32/ppu/bin/ppu-lv2-ar.exe
@@ -99,7 +111,8 @@ else ifeq ($(platform), ps3)
 
 # sncps3
 else ifeq ($(platform), sncps3)
-	TARGET := $(TARGET_NAME)_libretro_ps3.a
+	EXT=a
+	TARGET := $(TARGET_NAME)_libretro_ps3.$(EXT)
 	CC = $(CELL_SDK)/host-win32/sn/bin/ps3ppusnc.exe
 	CC_AS = $(CELL_SDK)/host-win32/sn/bin/ps3ppusnc.exe
 	AR = $(CELL_SDK)/host-win32/sn/bin/ps3snarl.exe
@@ -108,7 +121,8 @@ else ifeq ($(platform), sncps3)
 
 # Lightweight PS3 Homebrew SDK
 else ifeq ($(platform), psl1ght)
-	TARGET := $(TARGET_NAME)_libretro_psl1ght.a
+	EXT=a
+	TARGET := $(TARGET_NAME)_libretro_psl1ght.$(EXT)
 	CC = $(PS3DEV)/ppu/bin/ppu-gcc$(EXE_EXT)
 	CC_AS = $(PS3DEV)/ppu/bin/ppu-gcc$(EXE_EXT)
 	AR = $(PS3DEV)/ppu/bin/ppu-ar$(EXE_EXT)
@@ -117,7 +131,8 @@ else ifeq ($(platform), psl1ght)
 
 # PSP
 else ifeq ($(platform), psp1)
-   TARGET := $(TARGET_NAME)_libretro_psp1.a
+	EXT=a
+   TARGET := $(TARGET_NAME)_libretro_psp1.$(EXT)
    CC = psp-gcc$(EXE_EXT)
    AR = psp-ar$(EXE_EXT)
    PLATFORM_DEFINES := -DPSP -G0
@@ -125,7 +140,8 @@ else ifeq ($(platform), psp1)
 
 # Vita
 else ifeq ($(platform), vita)
-   TARGET := $(TARGET_NAME)_libretro_vita.a
+	EXT=a
+   TARGET := $(TARGET_NAME)_libretro_vita.$(EXT)
 	CC = arm-vita-eabi-gcc$(EXE_EXT)
 	AR = arm-vita-eabi-ar$(EXE_EXT)
    PLATFORM_DEFINES := -DVITA
@@ -133,7 +149,8 @@ else ifeq ($(platform), vita)
 
 # CTR (3DS)
 else ifeq ($(platform), ctr)
-	TARGET := $(TARGET_NAME)_libretro_ctr.a
+	EXT=a
+	TARGET := $(TARGET_NAME)_libretro_ctr.$(EXT)
 	CC = $(DEVKITARM)/bin/arm-none-eabi-gcc$(EXE_EXT)
 	AR = $(DEVKITARM)/bin/arm-none-eabi-ar$(EXE_EXT)
 	CFLAGS += -DARM11 -D_3DS
@@ -145,7 +162,8 @@ else ifeq ($(platform), ctr)
 
 # Nintendo Game Cube
 else ifeq ($(platform), ngc)
-	TARGET := $(TARGET_NAME)_libretro_ngc.a
+	EXT=a
+	TARGET := $(TARGET_NAME)_libretro_ngc.$(EXT)
 	CC = $(DEVKITPPC)/bin/powerpc-eabi-gcc$(EXE_EXT)
 	CC_AS = $(DEVKITPPC)/bin/powerpc-eabi-gcc$(EXE_EXT)
 	AR = $(DEVKITPPC)/bin/powerpc-eabi-ar$(EXE_EXT)
@@ -154,17 +172,24 @@ else ifeq ($(platform), ngc)
 
 # Nintendo Wii
 else ifeq ($(platform), wii)
-	TARGET := $(TARGET_NAME)_libretro_wii.a
+	EXT=a
+	TARGET := $(TARGET_NAME)_libretro_wii.$(EXT)
 	CC = $(DEVKITPPC)/bin/powerpc-eabi-gcc$(EXE_EXT)
 	CC_AS = $(DEVKITPPC)/bin/powerpc-eabi-gcc$(EXE_EXT)
 	AR = $(DEVKITPPC)/bin/powerpc-eabi-ar$(EXE_EXT)
 	PLATFORM_DEFINES += -DGEKKO -DHW_RVL -mrvl -mcpu=750 -meabi -mhard-float
 	STATIC_LINKING = 1
 else
-   TARGET := $(TARGET_NAME)_libretro.dll
+	EXT?=dll
+   TARGET := $(TARGET_NAME)_libretro.$(EXT)
    SHARED := -shared -static-libgcc -static-libstdc++ -Wl,--no-undefined -s
 endif
 
+ifeq ($(STATIC_LINKING),1)
+fpic=
+SHARED=
+endif
+
 ifeq ($(DEBUG), 1)
    CFLAGS += -O0 -g
 else