file: enable shared build

Signed-off-by: Timothy Gu <timothygu99@gmail.com>

src/file.mk

@@ -28,10 +28,7 @@ define $(PKG)_BUILD
     $(MAKE) -C '$(1).native/src' -j '$(JOBS)' file
 
     cd '$(1)' && ./configure \
-        --host='$(TARGET)' \
-        --build="`config.guess`" \
-        --disable-shared \
-        --prefix='$(PREFIX)/$(TARGET)' \
+        $(MXE_CONFIGURE_OPTS) \
         CFLAGS=-DHAVE_PREAD
     $(MAKE) -C '$(1)' -j '$(JOBS)' bin_PROGRAMS= sbin_PROGRAMS= noinst_PROGRAMS= man_MANS= FILE_COMPILE='$(1).native/src/file'
     $(MAKE) -C '$(1)' -j 1 install bin_PROGRAMS= sbin_PROGRAMS= noinst_PROGRAMS= man_MANS=
@@ -40,6 +37,4 @@ define $(PKG)_BUILD
         -W -Wall -Werror -ansi -pedantic \
         '$(2).c' -o '$(PREFIX)/$(TARGET)/bin/test-file.exe' \
         -lmagic -lgnurx -lshlwapi
-endef
-
-$(PKG)_BUILD_SHARED =
+endef