package/mupdf: fix building shared libraries

By default mupdf generates static libraries, shared libraries must be
enabled explicitely.

Also, when building shared libraries, mupdf's Makefile properly passes
-fPIC, so adding it manually to MUPDF_CFLAGS is not needed.

Signed-off-by: Raphaël Mélotte <raphael.melotte@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/mupdf/mupdf.mk

@@ -23,8 +23,7 @@ MUPDF_DEPENDENCIES = \
 	zlib
 
 MUPDF_CFLAGS = \
-	$(TARGET_CFLAGS) \
-	-fPIC # -fPIC is needed because the Makefile doesn't append it.
+	$(TARGET_CFLAGS)
 
 MUPDF_LDFLAGS = \
 	$(TARGET_LDFLAGS)
@@ -40,6 +39,12 @@ MUPDF_MAKE_OPTS = \
 	HAVE_OBJCOPY=no \
 	prefix="/usr"
 
+ifeq ($(BR2_STATIC_LIBS),y)
+MUPDF_MAKE_OPTS += shared=no
+else
+MUPDF_MAKE_OPTS += shared=yes
+endif
+
 ifeq ($(BR2_PACKAGE_LIBFREEGLUT),y)
 MUPDF_DEPENDENCIES += libfreeglut
 else