* configure.ac: New command line option --disable-pic. Use

LSH_CCPIC.

* Makefile.am (libnettle_a_CFLAGS): Added $(CCPIC), to attempt to
build also the static library as position independent code.

Rev: src/nettle/ChangeLog:1.274
Rev: src/nettle/Makefile.am:1.78
Rev: src/nettle/configure.ac:1.41