wasm: remove emterpreter flags

The “emterpreter” was the precursor to the current
asyncify support, but is not in use any more.

Pick-to: 6.3
Change-Id: I07ca04b61747e90939444525641b5aa34f7087b5
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>

mkspecs/wasm-emscripten/qmake.conf

@@ -28,13 +28,6 @@ load(emcc_ver)
     }
 }
 
-EMTERP_FLAGS = \
-    -s EMTERPRETIFY=1  \
-    -s EMTERPRETIFY_ASYNC=1 \
-    -s \"EMTERPRETIFY_FILE=\'data.binary\'\" \
-    -s ASSERTIONS=1 \
-    --profiling-funcs
-
 EMCC_COMMON_LFLAGS += \
     -s WASM=1 \
     -s FULL_ES2=1 \