Emscripten: its JavaScript runtime moves to os/emscripten

The platform, audio and camera libraries, the pre-js and the closure
externs the web build links in live under os/emscripten.

.github/workflows/Linux-samples-audio.yml

@@ -554,7 +554,7 @@ jobs:
           # audio/drivers/rwebaudio.c against a stand-in for its
           # JavaScript half: frames of the layout the page took go out
           # one plane per channel, and every byte count is in frames of
-          # that layout. Then emscripten/library_rwebaudio.js itself
+          # that layout. Then os/emscripten/library_rwebaudio.js itself
           # under Node with a mock AudioContext: the destination is
           # widened only past stereo and only as far as its
           # maxChannelCount allows, and a stereo one is left as it was.

Makefile.emscripten

@@ -193,9 +193,9 @@ LDFLAGS := -L. --no-heap-copy -s STACK_SIZE=$(STACK_SIZE) -s INITIAL_MEMORY=$(IN
            -s DISABLE_DEPRECATED_FIND_EVENT_TARGET_BEHAVIOR=0 \
            -s ENVIRONMENT=web,worker -s WASM_BIGINT=1 \
            -s FETCH=1 \
-           --extern-pre-js emscripten/extern_pre.js \
+           --extern-pre-js os/emscripten/extern_pre.js \
-           --js-library emscripten/library_rwebcam.js \
+           --js-library os/emscripten/library_rwebcam.js \
-           --js-library emscripten/library_platform_emscripten.js
+           --js-library os/emscripten/library_platform_emscripten.js
 
 ifeq ($(HAVE_OPENGLES), 1)
    ifeq ($(HAVE_OPENGLES3), 1)
@@ -214,7 +214,7 @@ ifeq ($(FS_DEBUG), 1)
 endif
 
 ifeq ($(HAVE_RWEBAUDIO), 1)
-   LDFLAGS += --js-library emscripten/library_rwebaudio.js
+   LDFLAGS += --js-library os/emscripten/library_rwebaudio.js
    DEFINES += -DHAVE_RWEBAUDIO
    ifeq ($(PROXY_TO_PTHREAD), 1)
       $(error ERROR: RWEBAUDIO is incompatible with PROXY_TO_PTHREAD)
@@ -290,7 +290,7 @@ else ifeq ($(ASYNC), 1)
 endif
 
 ifeq ($(CLOSURE_COMPILER), 1)
-   LDFLAGS += --closure 1 --closure-args=--externs=emscripten/closure_externs.js --post-js emscripten/closure_post.js
+   LDFLAGS += --closure 1 --closure-args=--externs=os/emscripten/closure_externs.js --post-js os/emscripten/closure_post.js
 endif
 
 include Makefile.common

samples/audio/rwebaudio/rwebaudio_js_test.js

@@ -1,4 +1,4 @@
-/* emscripten/library_rwebaudio.js under Node, against a mock
+/* os/emscripten/library_rwebaudio.js under Node, against a mock
  * AudioContext: the destination is widened only as far as its
  * maxChannelCount and only past stereo, passes channels through as
  * they are, and each queued buffer carries one plane per channel. A
@@ -42,7 +42,7 @@ const sandbox = {
    autoAddDeps: () => {},
 };
 vm.createContext(sandbox);
-vm.runInContext(fs.readFileSync(path.join(__dirname, "../../../emscripten/library_rwebaudio.js"), "utf8"), sandbox);
+vm.runInContext(fs.readFileSync(path.join(__dirname, "../../../os/emscripten/library_rwebaudio.js"), "utf8"), sandbox);
 check(lib !== null, "the library did not register");
 
 /* what emscripten makes of it: $X is X, the rest _X */