Remove macOS ppc support

Makefile

@@ -450,34 +450,7 @@ ifeq ($(PLATFORM),darwin)
 
   # Default minimum Mac OS X version
   ifeq ($(MACOSX_VERSION_MIN),)
-    MACOSX_VERSION_MIN=10.9
-    ifneq ($(findstring $(ARCH),ppc ppc64),)
-      MACOSX_VERSION_MIN=10.5
-    endif
-    ifeq ($(ARCH),x86)
-      MACOSX_VERSION_MIN=10.6
-    endif
-    ifeq ($(ARCH),x86_64)
-      # trying to find default SDK version is hard
-      # macOS 10.15 requires -sdk macosx but 10.11 doesn't support it
-      # macOS 10.6 doesn't have -show-sdk-version
-      DEFAULT_SDK=$(shell xcrun -sdk macosx -show-sdk-version 2> /dev/null)
-      ifeq ($(DEFAULT_SDK),)
-        DEFAULT_SDK=$(shell xcrun -show-sdk-version 2> /dev/null)
-      endif
-      ifeq ($(DEFAULT_SDK),)
-        $(error Error: Unable to determine macOS SDK version.  On macOS 10.6 to 10.8 run: make MACOSX_VERSION_MIN=10.6  On macOS 10.9 or later run: make MACOSX_VERSION_MIN=10.9 );
-      endif
-
-      ifneq ($(findstring $(DEFAULT_SDK),10.6 10.7 10.8),)
-        MACOSX_VERSION_MIN=10.6
-      else
-        MACOSX_VERSION_MIN=10.9
-      endif
-    endif
-    ifeq ($(ARCH),arm64)
-      MACOSX_VERSION_MIN=11.0
-    endif
+    MACOSX_VERSION_MIN=11.0
   endif
 
   MACOSX_MAJOR=$(shell echo $(MACOSX_VERSION_MIN) | cut -d. -f1)
@@ -495,24 +468,6 @@ ifeq ($(PLATFORM),darwin)
                  -DMAC_OS_X_VERSION_MIN_REQUIRED=$(MAC_OS_X_VERSION_MIN_REQUIRED)
 
   MACOSX_ARCH=$(ARCH)
-  ifeq ($(ARCH),x86)
-    MACOSX_ARCH=i386
-  endif
-
-  ifeq ($(ARCH),ppc)
-    BASE_CFLAGS += -arch ppc
-    ALTIVEC_CFLAGS = -faltivec
-  endif
-  ifeq ($(ARCH),ppc64)
-    BASE_CFLAGS += -arch ppc64
-    ALTIVEC_CFLAGS = -faltivec
-  endif
-  ifeq ($(ARCH),x86)
-    OPTIMIZEVM += -march=prescott -mfpmath=sse
-    # x86 vm will crash without -mstackrealign since MMX instructions will be
-    # used no matter what and they corrupt the frame pointer in VM calls
-    BASE_CFLAGS += -arch i386 -m32 -mstackrealign
-  endif
   ifeq ($(ARCH),x86_64)
     OPTIMIZEVM += -mfpmath=sse
     BASE_CFLAGS += -arch x86_64
@@ -586,39 +541,15 @@ ifeq ($(PLATFORM),darwin)
   RENDERER_LIBS += -framework OpenGL
 
   ifeq ($(USE_LOCAL_HEADERS),1)
-    ifeq ($(shell test $(MAC_OS_X_VERSION_MIN_REQUIRED) -ge 1090; echo $$?),0)
-      # Universal Binary 2 - for running on macOS 10.9 or later
-      # x86_64 (10.9 or later), arm64 (11.0 or later)
-      MACLIBSDIR=$(LIBSDIR)/macosx-ub2
-      BASE_CFLAGS += -I$(SDLHDIR)/include
-    else
-      # Universal Binary - for running on Mac OS X 10.5 or later
-      # ppc (10.5/10.6), x86 (10.6 or later), x86_64 (10.6 or later)
-      #
-      # x86/x86_64 on 10.5 will run the ppc build.
-      #
-      # SDL 2.0.1,  last with Mac OS X PowerPC
-      # SDL 2.0.4,  last with Mac OS X 10.5 (x86/x86_64)
-      # SDL 2.0.22, last with Mac OS X 10.6 (x86/x86_64)
-      #
-      # code/libs/macosx-ub/libSDL2-2.0.0.dylib contents
-      # - ppc build is SDL 2.0.1 with a header change so it compiles
-      # - x86/x86_64 build are SDL 2.0.22
-      MACLIBSDIR=$(LIBSDIR)/macosx-ub
-      ifneq ($(findstring $(ARCH),ppc ppc64),)
-        BASE_CFLAGS += -I$(SDLHDIR)/include-macppc
-      else
-        BASE_CFLAGS += -I$(SDLHDIR)/include-2.0.22
-      endif
-    endif
+    BASE_CFLAGS += -I$(SDLHDIR)/include
 
     # We copy sdlmain before ranlib'ing it so that subversion doesn't think
     #  the file has been modified by each build.
-    LIBSDLMAIN=$(B)/libSDL2main.a
-    LIBSDLMAINSRC=$(MACLIBSDIR)/libSDL2main.a
-    CLIENT_LIBS += $(MACLIBSDIR)/libSDL2-2.0.0.dylib
-    RENDERER_LIBS += $(MACLIBSDIR)/libSDL2-2.0.0.dylib
-    CLIENT_EXTRA_FILES += $(MACLIBSDIR)/libSDL2-2.0.0.dylib
+    LIBSDLMAIN = $(B)/libSDL2main.a
+    LIBSDLMAINSRC = $(LIBSDIR)/macosx-ub2/libSDL2main.a
+    CLIENT_LIBS += $(LIBSDIR)/macosx-ub2/libSDL2-2.0.0.dylib
+    RENDERER_LIBS += $(LIBSDIR)/macosx-ub2/libSDL2-2.0.0.dylib
+    CLIENT_EXTRA_FILES += $(LIBSDIR)/macosx-ub2/libSDL2-2.0.0.dylib
   else
     BASE_CFLAGS += -I/Library/Frameworks/SDL2.framework/Headers
     CLIENT_LIBS += -framework SDL2