Hide unneeded internal symbols when building raylib as an so or dylib (#3573)

src/CMakeLists.txt

@@ -62,12 +62,10 @@ if (NOT BUILD_SHARED_LIBS)
     add_library(raylib_static ALIAS raylib)
 else()
     MESSAGE(STATUS "Building raylib shared library")
-    if (WIN32)
-        target_compile_definitions(raylib
-                                   PRIVATE $<BUILD_INTERFACE:BUILD_LIBTYPE_SHARED>
-                                   INTERFACE $<INSTALL_INTERFACE:USE_LIBTYPE_SHARED>
-                                   )
-    endif ()
+    target_compile_definitions(raylib
+                               PRIVATE $<BUILD_INTERFACE:BUILD_LIBTYPE_SHARED>
+                               INTERFACE $<INSTALL_INTERFACE:USE_LIBTYPE_SHARED>
+                               )
 endif()
 
 if (${PLATFORM} MATCHES "Web")
@@ -84,6 +82,11 @@ if (WITH_PIC OR BUILD_SHARED_LIBS)
     set_property(TARGET raylib PROPERTY POSITION_INDEPENDENT_CODE ON)
 endif ()
 
+if (BUILD_SHARED_LIBS)
+    # Hide raylib's symbols by default so RLAPI can expose them
+    set_property(TARGET raylib PROPERTY C_VISIBILITY_PRESET hidden)
+endif ()
+
 target_link_libraries(raylib "${LIBS_PRIVATE}")
 
 # Sets some compile time definitions for the pre-processor