Merge pull request #875 from LuaAndC/imagemagick-shared

imagemagick: enable shared build

src/imagemagick.mk

@@ -19,10 +19,7 @@ endef
 
 define $(PKG)_BUILD
     cd '$(1)' && ./configure \
-        --host='$(TARGET)' \
-        --build="`config.guess`" \
-        --prefix='$(PREFIX)/$(TARGET)' \
-        --disable-shared \
+        $(MXE_CONFIGURE_OPTS) \
         --with-x=no \
         --without-zlib \
         --disable-largefile \
@@ -38,5 +35,3 @@ define $(PKG)_BUILD
         '$(2).cpp' -o '$(PREFIX)/$(TARGET)/bin/test-imagemagick.exe' \
         `'$(TARGET)-pkg-config' ImageMagick++ --cflags --libs`
 endef
-
-$(PKG)_BUILD_SHARED =