COMP: adjust ARM compilation flags (#1225)

- with -mcpu=native for automatic detection and -armpl for linking in
  the performance libraries

wmake/rules/linuxARM64Arm/c

 SUFFIXES += .c
 
-cc          = armclang
+cc          = armclang -mpcu=native
 
 cWARN       = -Wall
 
@@ -12,5 +12,5 @@ ctoo        = $(WM_SCHEDULER) $(cc) $(cFLAGS) -c $< -o $@
 
 LINK_LIBS   = $(cDBUG)
 
-LINKLIBSO   = $(cc) -shared
-LINKEXE     = $(cc) -Xlinker --add-needed -Xlinker -z -Xlinker nodefs
+LINKLIBSO   = $(cc) -shared -armpl
+LINKEXE     = $(cc) -Xlinker --add-needed -Xlinker -z -Xlinker nodefs -armpl

wmake/rules/linuxARM64Arm/c++

 include $(GENERAL_RULES)/Clang/c++
 
-CC          = armclang++ -std=c++11
+CC          = armclang++ -std=c++11 -mcpu=native
 
 include $(DEFAULT_RULES)/c++$(WM_COMPILE_OPTION)
 
@@ -13,5 +13,5 @@ cpptoo      = $(Ctoo)
 
 LINK_LIBS   = $(c++DBUG)
 
-LINKLIBSO   = $(CC) $(c++FLAGS) -shared
-LINKEXE     = $(CC) $(c++FLAGS) -Xlinker --add-needed
+LINKLIBSO   = $(CC) $(c++FLAGS) -shared -armpl
+LINKEXE     = $(CC) $(c++FLAGS) -Xlinker --add-needed -armpl

wmake/rules/linuxARM64Arm/c++Opt

 c++DBUG     =
-c++OPT      = -mcpu=thunderx2t99 -ffp-contract=fast -ffast-math -O3 -funsafe-math-optimizations
+c++OPT      = -ffp-contract=fast -ffast-math -O3 -funsafe-math-optimizations -fsimdmath -armpl

wmake/rules/linuxARM64Arm/cOpt

 cDBUG       =
-cOPT        = -mcpu=thunderx2t99 -ffp-contract=fast -ffast-math -O3
+cOPT        = -ffp-contract=fast -ffast-math -O3 -armpl