Remove -static-libgcc -static-libstdc++ for cross again

The resulting gem was 18 MB with these, removing them makes it go back
to 2.6 MB again. Something changed somewhere :).

Author: robinst

tasks/ext.rake

@@ -7,8 +7,7 @@ tmp = "#{Dir.pwd}/tmp/#{$plat}"
 toolchain_file = "#{Dir.pwd}/ext/win.cmake"
 install_dir = "#{tmp}/install"
 install_dll = "#{install_dir}/bin/libtag.dll"
-ldflags = "-static-libgcc -static-libstdc++"
-$cross_config_options = [%(--with-opt-dir=#{install_dir} --with-ldflags="#{ldflags}")]
+$cross_config_options = ["--with-opt-dir=#{install_dir}"]
 
 taglib_version = '1.9.1'
 taglib = "taglib-#{taglib_version}"
@@ -69,7 +68,7 @@ end
 
 file install_dll => ["#{tmp}/#{taglib}"] do
   chdir "#{tmp}/#{taglib}" do
-    sh %(cmake -DCMAKE_INSTALL_PREFIX=#{install_dir} -DCMAKE_TOOLCHAIN_FILE=#{toolchain_file} -DCMAKE_SHARED_LINKER_FLAGS="#{ldflags}" #{taglib_options})
+    sh %(cmake -DCMAKE_INSTALL_PREFIX=#{install_dir} -DCMAKE_TOOLCHAIN_FILE=#{toolchain_file} #{taglib_options})
     sh "make VERBOSE=1"
     sh "make install"
   end