COMP: manage cpu architecture with cARCH, c++ARCH internal make variables

- allows better separation from compiler settings

- use -fPIC instead of legacy -KPIC for intel compiler

wmake/rules/General/Gcc/c

@@ -2,6 +2,7 @@ SUFFIXES += .c
 
 cc          = gcc
 
+cARCH       =
 cDBUG       =
 cOPT        = -O2
 cWARN       = -Wall

wmake/rules/General/Gcc/c++

@@ -2,6 +2,7 @@ SUFFIXES += .C .cc .cpp .cxx
 
 CC          = g++ -std=c++11
 
+c++ARCH     =
 c++DBUG     =
 c++OPT      = -O2
 ptFLAGS     = -DNoRepository -ftemplate-depth-100