build: fix rule for building dynamic files

Previously the architecture-specific dynamic files were relying on the
built-in rules alone.

Author: vtjnash

driver/others/Makefile

@@ -127,10 +127,10 @@ endif
 xerbla.$(SUFFIX) : xerbla.c
 	$(CC) $(CFLAGS) -c $< -o $(@F)
 
-dynamic.$(SUFFIX) : dynamic.c
+dynamic%.$(SUFFIX) : dynamic%.c
 	$(CC) $(CFLAGS) -c $< -o $(@F)
 
-dynamic.$(PSUFFIX) : dynamic.c
+dynamic%.$(PSUFFIX) : dynamic%.c
 	$(CC) $(PFLAGS) -c $< -o $(@F)
 
 parameter.$(SUFFIX) : parameter.c ../../param.h