[Java Bindings] .so not being built on Ubuntu 16.04

[silvanheller]

Steps to reproduce:

• sudo ./configure --enable-shared --enable-java --disable-audio-hash --disable-video-hash --disable-pthread
• sudo make
• cd bindings/java
• javac org/pHash/*.java
• sudo make install

Result:
java -Djava.library.path=/usr/local/lib org.pHash.pHash -mh img1.jpg img2.jpg

Exception in thread "main" java.lang.UnsatisfiedLinkError: no pHash-jni in java.library.path
	at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
	at java.lang.Runtime.loadLibrary0(Runtime.java:870)
	at java.lang.System.loadLibrary(System.java:1122)
	at org.pHash.pHash.<clinit>(pHash.java:22)

Since there is no libpHash-jni.so nor libpHash.so at /usr/local/lib