Applied PCem patch #d12b9ef.

Applied PCem patch #ef2c34c.
Updated vidapi to enable/disable the renderers on resize (patch from 86Box.)
Re-worked the D2D renderer to actually work when dynloaded.
Some more changes to the VNC renderer.  Not done yet, the library is horrible.
Updated the Travis work files to allow for downloadable dependencies.

.travis-build.sh

@@ -9,7 +9,7 @@
 #
 #		Build script for the Travis CI remote builder service.
 #
-# Version:	@(#).travis-build.sh	1.0.6	2019/04/27
+# Version:	@(#).travis-build.sh	1.0.7	2019/04/30
 #
 # Author:	Fred N. van Kempen, <decwiz@yahoo.com>
 #
@@ -45,6 +45,9 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING  IN ANY  WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+    # Define the build options here.
+    OPTS=D2D=d SDL=d VNC=d PNG=d
+
     if [ "x${DEV_BUILD}" = "xy" ]; then
 	TARGET="win-${TRAVIS_BUILD_NUMBER}_dev-x86"
     elif [ "x${DEBUG}" = "xy" ]; then
@@ -54,21 +57,26 @@
     else
 	TARGET="win-${TRAVIS_BUILD_NUMBER}-x86"
     fi
-    echo "Building VARCem, build #${TRAVIS_BUILD_NUMBER} target ${TARGET}"
-
-    cd src
 
     # We only need the first few characters of the commit ID.
     export COMMIT=${TRAVIS_COMMIT::7}
 
+    echo "Downloading VARCem build dependencies.."
+    curl -# ${EXTDEP_URL} | tar xzf - 2>/dev/null
+
     # Build the project.
-    make -f win/mingw/Makefile.MinGW BUILD=${TRAVIS_BUILD_NUMBER}
+    echo "Building VARCem, build #${TRAVIS_BUILD_NUMBER} target ${TARGET}"
+
+    cd src
+
+    make -f win/mingw/Makefile.MinGW ${OPTS} BUILD=${TRAVIS_BUILD_NUMBER}
     if [ $? != 0 ]; then
 	echo "Build failed, not uploading." 
 
 	exit 1
     fi
 
+    # Package the results so we can upload them.
     echo "Build #${TRAVIS_BUILD_NUMBER} OK, packing up."
 
     zip -9 ../${TARGET}.zip *.exe