Bug 1605215 - add install rules for `WASM_LIBRARY`; r=firefox-build-system-reviewers,rstewart

Differential Revision: https://phabricator.services.mozilla.com/D57871

--HG--
extra : moz-landing-system : lando

config/makefiles/target_binaries.mk

@@ -24,6 +24,13 @@ endif
 INSTALL_TARGETS += SHARED_LIBRARY
 endif # SHARED_LIBRARY
 
+ifdef WASM_LIBRARY
+WASM_LIBRARY_FILES = $(WASM_LIBRARY)
+WASM_LIBRARY_DEST ?= $(FINAL_TARGET)
+WASM_LIBRARY_TARGET = target
+INSTALL_TARGETS += WASM_LIBRARY
+endif
+
 ifneq (,$(strip $(HOST_SIMPLE_PROGRAMS)))
 HOST_PROGRAMS_EXECUTABLES = $(HOST_SIMPLE_PROGRAMS) $(HOST_RUST_PROGRAMS)
 HOST_PROGRAMS_DEST ?= $(DIST)/host/bin