Install header for private/experimental API functions

This allows client developers to use the private API without
needing to manually specify the header path in the source
code, which may vary from system to system.

BUILD.bazel

@@ -8,16 +8,19 @@ genrule(
     srcs = [
         "//c-toxcore/toxav:toxav.h",
         "//c-toxcore/toxcore:tox.h",
+        "//c-toxcore/toxcore:tox_private.h",
         "//c-toxcore/toxencryptsave:toxencryptsave.h",
     ],
     outs = [
         "tox/toxav.h",
         "tox/tox.h",
+        "tox/tox_private.h",
         "tox/toxencryptsave.h",
     ],
     cmd = """
         cp $(location //c-toxcore/toxav:toxav.h) $(GENDIR)/c-toxcore/tox/toxav.h
         cp $(location //c-toxcore/toxcore:tox.h) $(GENDIR)/c-toxcore/tox/tox.h
+        cp $(location //c-toxcore/toxcore:tox_private.h) $(GENDIR)/c-toxcore/tox/tox_private.h
         cp $(location //c-toxcore/toxencryptsave:toxencryptsave.h) $(GENDIR)/c-toxcore/tox/toxencryptsave.h
     """,
     visibility = ["//visibility:public"],

CMakeLists.txt

@@ -316,7 +316,8 @@ set(toxcore_PKGCONFIG_REQUIRES ${toxcore_PKGCONFIG_REQUIRES} libsodium)
 set(toxcore_API_HEADERS
   ${toxcore_SOURCE_DIR}/toxcore/tox.h^tox
   ${toxcore_SOURCE_DIR}/toxcore/tox_events.h^tox
-  ${toxcore_SOURCE_DIR}/toxcore/tox_dispatch.h^tox)
+  ${toxcore_SOURCE_DIR}/toxcore/tox_dispatch.h^tox
+  ${toxcore_SOURCE_DIR}/toxcore/tox_private.h^tox)
 
 ################################################################################
 #

toxcore/BUILD.bazel

@@ -3,7 +3,10 @@ load("@rules_fuzzing//fuzzing:cc_defs.bzl", "cc_fuzz_test")
 load("//tools:no_undefined.bzl", "cc_library")
 
 exports_files(
-    srcs = ["tox.h"],
+    srcs = [
+        "tox.h",
+        "tox_private.h",
+    ],
     visibility = ["//c-toxcore:__pkg__"],
 )