Don't check for libjpeg when building without libvlc

Since we don't generate the thumbnails, no need for libjpeg to compress
them

Makefile.am

@@ -206,6 +206,12 @@ libmedialibrary_la_LIBADD += libmedialibrary_macos.la
 libmedialibrary_la_LDFLAGS += -Wl,-undefined,dynamic_lookup,-framework,Foundation
 endif
 
+lib_LTLIBRARIES = libmedialibrary.la
+if HAVE_DARWIN
+lib_LTLIBRARIES += libmedialibrary_macos.la
+endif
+
+if HAVE_LIBVLC
 
 if HAVE_LIBJPEG
 libmedialibrary_la_SOURCES += src/metadata_services/vlc/imagecompressors/JpegCompressor.cpp
@@ -214,12 +220,6 @@ libmedialibrary_la_CPPFLAGS += $(LIBJPEG_CFLAGS)
 libmedialibrary_la_LIBADD += $(LIBJPEG_LIBS)
 endif
 
-lib_LTLIBRARIES = libmedialibrary.la
-if HAVE_DARWIN
-lib_LTLIBRARIES += libmedialibrary_macos.la
-endif
-
-if HAVE_LIBVLC
 libmedialibrary_la_SOURCES += \
 	src/metadata_services/vlc/VLCMetadataService.cpp \
 	src/metadata_services/vlc/VLCThumbnailer.cpp \

configure.ac

@@ -294,23 +294,22 @@ AS_IF([test "${with_libvlc}" != "no"], [
             AC_SUBST([VLCPP_CFLAGS],[-I${srcdir}/libvlcpp])
         ]
     )
+    PKG_CHECK_MODULES(LIBJPEG, libjpeg, [
+         have_libjpeg="yes"
+         AC_DEFINE(HAVE_JPEG, 1, [Define to 1 if libjpeg is available])
+     ], [
+        dnl Falling back to libjpeg.h based detection
+        AC_CHECK_HEADERS(jpeglib.h, [
+            have_libjpeg="yes"
+            AC_SUBST(LIBJPEG_LIBS, "-ljpeg")
+        ])
+     ])
 ])
 AM_CONDITIONAL(HAVE_LIBVLC, [test "${with_libvlc}" != "no"])
+AM_CONDITIONAL([HAVE_LIBJPEG], [test "${have_libjpeg}" = "yes"])
 
 PKG_CHECK_MODULES(SQLITE, sqlite3)
 
-PKG_CHECK_MODULES(LIBJPEG, libjpeg, [
-     have_libjpeg="yes"
-     AC_DEFINE(HAVE_JPEG, 1, [Define to 1 if libjpeg is available])
- ], [
-dnl Falling back to libjpeg.h based detection
-    AC_CHECK_HEADERS(jpeglib.h, [
-        have_libjpeg="yes"
-        AC_SUBST(LIBJPEG_LIBS, "-ljpeg")
-    ])
- ])
-AM_CONDITIONAL([HAVE_LIBJPEG], [test "${have_libjpeg}" = "yes"])
-
 AC_ARG_ENABLE(tests,AC_HELP_STRING([--disable-tests], [Disable build of automated tests suites]))
 AM_CONDITIONAL([HAVE_TESTS], [test "${enable_tests}" = "yes"])
 AS_IF([test "${enable_tests}" = "yes"], [