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>

library/libproc2.pc.in

@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libproc-2
+Description: Library to control and query process state
+Version: @VERSION@
+Libs: -L${libdir} -lproc-2
+Libs.private:
+Cflags: -I${includedir}