Improve WebAssembly build

Add compatibility with old and new versions of the Emscripten system libraries

Linux/ZillaLibLinux.mk

@@ -121,11 +121,7 @@ endif
 .PHONY: all clean run gdb
 all: $(APPOUTBIN) $(ASSET_ZIP)
 
-define MAKEAPPOBJ
-
-$(APPOUTDIR)/$(basename $(notdir $(1)))$(OBJEXT): $(1) ; $$(call COMPILE,$$@,$$<,$(2),$(GCCMFLAG) $(3) $$(APPFLAGS) -MMD -MP)
-
-endef
+MAKEAPPOBJ = $(APPOUTDIR)/$(basename $(notdir $(1)))$(OBJEXT): $(1) ; $$(call COMPILE,$$@,$$<,$(2),$(GCCMFLAG) $(3) $$(APPFLAGS) -MMD -MP)
 
 APPOBJS := $(addprefix $(APPOUTDIR)/,$(notdir $(patsubst %.c,%$(OBJEXT),$(patsubst %.cpp,%$(OBJEXT),$(APPSOURCES)))))
 $(shell $(CMD_DEL_OLD_OBJ) $(APPOBJS:%.o=%.d))

WebAssembly/README.md

@@ -25,7 +25,7 @@ On Windows it's much simpler to use 7zip to just extract `clang.exe` and `wasm-l
 
 ## Getting System Libraries
 The system libraries are maintained in the [Emscripten project](https://github.com/emscripten-core/emscripten/tree/master/system).  
-Just download the [GitHub archive](https://github.com/emscripten-core/emscripten/archive/master.zip) and extract only the `System` directory from it.
+Just download the [GitHub archive](https://github.com/emscripten-core/emscripten/archive/refs/heads/main.zip) and extract only the `System` directory from it.
 
 ## Getting Python
 If you already have Python (any version) on your system, you're good to go.  

WebAssembly/ZillaLibWasm.js

@@ -1285,7 +1285,7 @@ env.asin = env.asinf = Math.asin;
 env.sqrt = env.sqrtf = Math.sqrt;
 env.atan = env.atanf = Math.atan;
 env.atan2 = env.atan2f = Math.atan2;
-env.fabs = env.fabsf = env.abs = Math.abs;
+env.fabs = env.fabsf = env.abs = env.fabsl = Math.abs;
 env.round = env.roundf = env.rint = env.rintf = Math.round;
 
 ZLJS_WASM_IMPORTS(env);