[browser][wasm] Fix makefile build error with provision-wasm

[kjpou1]

Running make -C src/mono/wasm provision-wasm produced the following errors:

cd emsdk && ./emsdk install `cat emscripten-version.txt`
cat: emscripten-version.txt: No such file or directory

as well as the following subsequent errors:

HEAD is now at 7cba2e0 2.0.15 (#743)
cd emsdk && ./emsdk install `cat /Users/Jimmy/websharp/projects/runtime-issues/src/mono/wasm/emscripten-version.txt`

touch .stamp-wasm-install-and-select-`cat
/bin/sh: -c: line 0: unexpected EOF while looking for matching ``'
/bin/sh: -c: line 1: syntax error: unexpected end of file
make: *** [.stamp-wasm-install-and-select-`cat] Error 2

Fix #49862

[ghost]

Tagging subscribers to this area: @directhex
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Running make -C src/mono/wasm provision-wasm produced the following errors:

cd emsdk && ./emsdk install `cat emscripten-version.txt`
cat: emscripten-version.txt: No such file or directory

as well as the following subsequent errors:

HEAD is now at 7cba2e0 2.0.15 (#743)
cd emsdk && ./emsdk install `cat /Users/Jimmy/websharp/projects/runtime-issues/src/mono/wasm/emscripten-version.txt`

touch .stamp-wasm-install-and-select-`cat
/bin/sh: -c: line 0: unexpected EOF while looking for matching ``'
/bin/sh: -c: line 1: syntax error: unexpected end of file
make: *** [.stamp-wasm-install-and-select-`cat] Error 2

Author:	kjpou1
Assignees:	-
Labels:	area-Infrastructure-mono
Milestone:	-

[ghost]

Tagging subscribers to 'arch-wasm': @lewing
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Running make -C src/mono/wasm provision-wasm produced the following errors:

cd emsdk && ./emsdk install `cat emscripten-version.txt`
cat: emscripten-version.txt: No such file or directory

as well as the following subsequent errors:

HEAD is now at 7cba2e0 2.0.15 (#743)
cd emsdk && ./emsdk install `cat /Users/Jimmy/websharp/projects/runtime-issues/src/mono/wasm/emscripten-version.txt`

touch .stamp-wasm-install-and-select-`cat
/bin/sh: -c: line 0: unexpected EOF while looking for matching ``'
/bin/sh: -c: line 1: syntax error: unexpected end of file
make: *** [.stamp-wasm-install-and-select-`cat] Error 2

Fix #49862

Author:	kjpou1
Assignees:	kjpou1
Labels:	arch-wasm, area-Infrastructure-mono
Milestone:	-