Recommend compiling with PIC consistently.

While shared objects with non-PIC code work on some architectures
(notably x86), unless code is always PIC on that arch (not true for x86)
doing so requires runtime relocations, which prevents the object
actually being shared, and means such segments can't be marked as
read-only.

Doc/Manual/Scripting.html

@@ -368,17 +368,12 @@ for a few common platforms is shown below:</p>
 
 <div class="shell"><pre>
 # Build a shared library for Solaris
-gcc -c example.c example_wrap.c -I/usr/local/include
+gcc -fpic -c example.c example_wrap.c -I/usr/local/include
 ld -G example.o example_wrap.o -o example.so
 
 # Build a shared library for Linux
 gcc -fpic -c example.c example_wrap.c -I/usr/local/include
 gcc -shared example.o example_wrap.o -o example.so
-
-# Build a shared library for Irix
-gcc -c example.c example_wrap.c -I/usr/local/include
-ld -shared example.o example_wrap.o -o example.so
-
 </pre></div>
 
 <p>