grep: cleanup configure args

package/grep/grep.mk

@@ -37,17 +37,7 @@ $(GNUGREP_DIR)/.configured: $(GNUGREP_DIR)/.unpacked
 		--target=$(GNU_TARGET_NAME) \
 		--host=$(GNU_TARGET_NAME) \
 		--build=$(GNU_HOST_NAME) \
-		--prefix=/usr \
-		--exec-prefix=/usr \
-		--bindir=/usr/bin \
-		--sbindir=/usr/sbin \
-		--libdir=/lib \
-		--libexecdir=/usr/lib \
-		--sysconfdir=/etc \
-		--datadir=/usr/share \
-		--localstatedir=/var \
-		--mandir=/usr/man \
-		--infodir=/usr/info \
+		--prefix=/ \
 		$(DISABLE_NLS) \
 		$(DISABLE_LARGEFILE) \
 		--disable-perl-regexp \