Use dynamic implib wrapper for all X11 libs

scripts.d/45-x11/50-libxext.sh

@@ -16,8 +16,8 @@ ffbuild_dockerbuild() {
 
     local myconf=(
         --prefix="$FFBUILD_PREFIX"
-        --disable-shared
-        --enable-static
+        --enable-shared
+        --disable-static
         --with-pic
         --without-xmlto
         --without-fop
@@ -34,7 +34,12 @@ ffbuild_dockerbuild() {
         return -1
     fi
 
+    export CFLAGS="$RAW_CFLAGS"
+    export LDFLAFS="$RAW_LDFLAGS"
+
     ./configure "${myconf[@]}"
     make -j$(nproc)
     make install
+
+    gen-implib "$FFBUILD_PREFIX"/lib/{libXext.so.6,libXext.a}
 }