library: Rename to libproc2

The newlib library used to be called libproc-2 but the new
name is preferred.

References:
 https://www.freelists.org/post/procps/Next-for-newlib,3

Signed-off-by: Craig Small <csmall@dropbear.xyz>

.gitignore

@@ -44,11 +44,11 @@ src/pkill
 src/pmap
 src/pidwait
 procps-ng-*.tar.xz
-proc/.depend
-proc/libproc-2.la
-proc/libproc-2.pc
-proc/Makefile
-proc/Makefile.in
+library/.depend
+library/libproc2.la
+library/libproc2.pc
+library/Makefile
+library/Makefile.in
 src/ps/Makefile
 src/ps/Makefile.in
 src/ps/pscommand