Android: Link ppsspp_jni with -Bsymbolic-functions

Calls between functions in the library went through PLT stubs, since it's
built with default visibility. The stubs were about 5% of JIT compile time on
a Galaxy S8 (the IR passes call many small helpers in other files), and a few
percent of the emulator thread in general. --jit-bench: 27 -> 25 us per block.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CMakeLists.txt

@@ -1129,6 +1129,9 @@ if(ANDROID AND NOT LIBRETRO)
 		# what openxr_loader was previously only being linked into.
 		target_link_libraries(ppsspp_jni openxr_loader)
 	endif()
+	# Calls between our own functions bind directly, rather than through the PLT (which cost a few
+	# percent of the emulator thread on a Galaxy S8). Nothing outside needs to interpose them.
+	target_link_options(ppsspp_jni PRIVATE "-Wl,-Bsymbolic-functions")
 	if(ARM64)
 		# Support 16kb page size on Android
 		target_link_options(ppsspp_jni PRIVATE "-Wl,-z,max-page-size=16384")

android/jni/Android.mk

@@ -1140,6 +1140,9 @@ LOCAL_SRC_FILES := \
   $(SRC)/UI/CustomButtonMappingScreen.cpp \
   $(SRC)/UI/RetroAchievementScreens.cpp
 
+# Calls between our own functions bind directly, not through the PLT (see CMakeLists.txt).
+LOCAL_LDFLAGS += -Wl,-Bsymbolic-functions
+
 ifneq ($(SKIPAPP),1)
   include $(BUILD_SHARED_LIBRARY)
 endif