use $(AWK) in Makefile.install and switch it to nawk

Makefile.install

@@ -29,7 +29,7 @@ install : 	lib.grd
 #for inc
 	@echo \#ifndef OPENBLAS_CONFIG_H > $(DESTDIR)$(OPENBLAS_INCLUDE_DIR)/openblas_config.h
 	@echo \#define OPENBLAS_CONFIG_H >> $(DESTDIR)$(OPENBLAS_INCLUDE_DIR)/openblas_config.h
-	@awk 'NF {print $$1, "OPENBLAS_"$$2, $$3}' config_last.h >> $(DESTDIR)$(OPENBLAS_INCLUDE_DIR)/openblas_config.h
+	@$(AWK) 'NF {print $$1, "OPENBLAS_"$$2, $$3}' config_last.h >> $(DESTDIR)$(OPENBLAS_INCLUDE_DIR)/openblas_config.h
 	@echo \#define OPENBLAS_VERSION \" OpenBLAS $(VERSION) \" >> $(DESTDIR)$(OPENBLAS_INCLUDE_DIR)/openblas_config.h
 	@cat openblas_config_template.h >> $(DESTDIR)$(OPENBLAS_INCLUDE_DIR)/openblas_config.h
 	@echo \#endif  \/\* OPENBLAS_CONFIG_H \*\/ >> $(DESTDIR)$(OPENBLAS_INCLUDE_DIR)/openblas_config.h

Makefile.system

@@ -962,7 +962,7 @@ ifndef MD5SUM
 MD5SUM	= md5sum
 endif
 
-AWK	= awk
+AWK	= nawk
 
 REVISION = -r$(VERSION)
 MAJOR_VERSION = $(word 1,$(subst ., ,$(VERSION)))