cmake: Fix PLATFORM_WEB build

Did this ever work? Surely, doesn't look like it...

.travis.yml

@@ -5,7 +5,8 @@ git:
   depth: 3
 
 # TODO we could use a 32 bit Docker container for running true 32-bit tests
-# services: - docker
+services:
+  - docker
 
 matrix:
   include:
@@ -16,10 +17,10 @@ matrix:
       env: ARCH=amd64
       sudo: required
     - os: linux
-      env: ARCH=amd64 GLFW=SYSTEM
+      env: ARCH=amd64 GLFW=SYSTEM RELEASE=NO
       sudo: required
     - os: linux
-      env: USE_WAYLAND=ON ARCH=amd64
+      env: USE_WAYLAND=ON ARCH=amd64 RELEASE=NO
       sudo: required
       addons:
           apt:
@@ -30,13 +31,15 @@ matrix:
     - os: osx
       env: ARCH=universal
     - os: linux
-      env: ARCH=arm64-android
+      env: ARCH=arm64-android RELEASE=NO
+      sudo: required
+    - os: linux
+      env: ARCH=html5 RELEASE=NO
       sudo: required
 
 before_script:
 
 before_install:
-  - export PLATFORM=Desktop
   - if [ "$TRAVIS_OS_NAME" == "linux" ]; then
       if [[ "$ARCH" == *-android ]]; then
         export RAYLIB_PACKAGE_SUFFIX="-Android-arm64";
@@ -44,9 +47,14 @@ before_install:
         unzip -qq android-ndk*.zip;
         android-ndk*/build/tools/make_standalone_toolchain.py --arch arm64 --api 21 --install-dir /tmp/android-toolchain;
         export PATH=/tmp/android-toolchain/bin:$PATH;
-        export PLATFORM=Android;
+        export CMAKE_ARCH_ARGS='-DPLATFORM=Android';
         export CC=aarch64-linux-android-clang;
         export CXX=aarch64-linux-android-clang++;
+      elif [ "$ARCH" == "html5" ]; then
+        export RAYLIB_PACKAGE_SUFFIX="-html5";
+        docker run --privileged=true -dit --name emscripten -v $(pwd):/src trzeci/emscripten:sdk-incoming-64bit bash;
+        export CMAKE_ARCH_ARGS='-DPLATFORM=Web -DCMAKE_TOOLCHAIN_FILE=../cmake/emscripten.cmake';
+        export RUNNER='docker exec -it emscripten cmake -E chdir build';
       else
         sudo apt-get install -y gcc-multilib
                                 libasound2-dev:$ARCH
@@ -68,10 +76,10 @@ before_install:
       export RAYLIB_PACKAGE_SUFFIX="-macOS";
       if [ "$GLFW" == "SYSTEM" ]; then brew update; brew install glfw; fi;
     fi
-  - "$CC --version"
+  - mkdir build
+  - $RUNNER $CC --version
 
 script:
-  - mkdir build
   - cd build
   - if test -n "${USE_WAYLAND}";
       then wget https://mirrors.kernel.org/ubuntu/pool/universe/e/extra-cmake-modules/extra-cmake-modules_5.38.0a-0ubuntu1_amd64.deb;
@@ -81,12 +89,12 @@ script:
       git checkout 1.12 && ./autogen.sh --prefix=/usr && make && sudo make install;
       popd;
     fi
-  - cmake $CMAKE_ARCH_ARGS -DMACOS_FATLIB=ON -DSTATIC=ON -DSHARED=ON -DBUILD_EXAMPLES=ON -DBUILD_GAMES=ON -DUSE_EXTERNAL_GLFW=IF_POSSIBLE -DUSE_WAYLAND=${USE_WAYLAND} -DPLATFORM=${PLATFORM} ..
-  - make VERBOSE=1
-  - if [ "$GLFW" != "SYSTEM" ]; then make package; fi;
-  - sudo make install
-  - pkg-config --static --libs raylib
-  - if [[ "$ARCH" != *-android ]]; then
+  - $RUNNER cmake $CMAKE_ARCH_ARGS -DMACOS_FATLIB=ON -DSTATIC=ON -DSHARED=ON -DBUILD_EXAMPLES=ON -DBUILD_GAMES=ON -DUSE_EXTERNAL_GLFW=IF_POSSIBLE -DUSE_WAYLAND=${USE_WAYLAND} ..
+  - $RUNNER make VERBOSE=1
+  - if [ "$RELEASE" != "NO" ]; then $RUNNER make package; fi;
+  - sudo $RUNNER make install
+  - if [[ "$ARCH" != *-android && "$ARCH" != html5 ]]; then
+      pkg-config --static --libs raylib;
       nm -g release/libraylib.a | grep glfwGetProcAddress || (echo "libraylib.a doesn't contain GLFW symbols! Aborting..." && false);
     fi