Fix makefile fragment for linux on arm (#147)

* Update comments describing configuration this makefile fragment supports.

* Remove extra compiler options for suggested gcc build

* Remove unnecessary -m32 option for suggested clang build

* switch default compiler from clang to gcc

Author: nbriggs

bin/makefile-linux.armv7l-x

@@ -1,7 +1,8 @@
-# Options for Linux, Intel 386/486 and X-Window
+# Options for Linux, ARMv7 and X-Window
+
+CC = gcc $(GCC_CFLAGS)
+#CC = clang $(CLANG_CFLAGS)
 
-#CC = gcc -m32 $(GCC_CFLAGS) -fno-omit-frame-pointer -Wall -Wextra -fno-aggressive-loop-optimizations
-CC = clang -m32 $(CLANG_CFLAGS)
 XFILES = $(OBJECTDIR)xmkicon.o \
 	$(OBJECTDIR)xbbt.o \
 	$(OBJECTDIR)dspif.o \
@@ -12,7 +13,6 @@ XFILES = $(OBJECTDIR)xmkicon.o \
 	$(OBJECTDIR)xrdopt.o \
 	$(OBJECTDIR)xwinman.o
 
-
 XFLAGS = -DXWINDOW -DNOPIXRECT
 
 # This is to make the %$#@! Apollo cc happy