MAINT: use the new arguments in some places

library_builders.sh

@@ -170,16 +170,12 @@ function build_xz {
 }
 
 function build_libwebp {
-    if [ -e libwebp-stamp ]; then return; fi
     build_libpng
     build_tiff
     build_giflib
-    fetch_unpack https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-${LIBWEBP_VERSION}.tar.gz
-    (cd libwebp-${LIBWEBP_VERSION} && \
-        ./configure --enable-libwebpmux --enable-libwebpdemux --prefix=$BUILD_PREFIX \
-        && make \
-        && make install)
-    touch libwebp-stamp
+    build_simple libwebp $LIBWEBP_VERSION \
+        https://storage.googleapis.com/downloads.webmproject.org/releases/webp/ \
+        --enable-libwebpmux --enable-libwebpdemux 
 }
 
 function build_freetype {
@@ -194,15 +190,10 @@ function build_libyaml {
 
 function build_szip {
     # Build szip without encoding (patent restrictions)
-    if [ -e szip-stamp ]; then return; fi
     build_zlib
-    local szip_url=https://www.hdfgroup.org/ftp/lib-external/szip/
-    fetch_unpack ${szip_url}/$SZIP_VERSION/src/szip-$SZIP_VERSION.tar.gz
-    (cd szip-$SZIP_VERSION \
-        && ./configure --enable-encoding=no --prefix=$BUILD_PREFIX \
-        && make \
-        && make install)
-    touch szip-stamp
+    build_simple szip $SZIP_VERSION \
+        https://www.hdfgroup.org/ftp/lib-external/szip/ \
+        --enable-encoding=no
 }
 
 function build_hdf5 {