grep: need pcre, no parallel building possible

Signed-off-by: Phil Sutter <phil@nwl.cc>

package/grep/Makefile

@@ -9,8 +9,10 @@ PKG_RELEASE:=		2
 PKG_MD5SUM:=		92258031d98d4f12dfc6a6d24057e672
 PKG_DESCR:=		global search for a regular expression and print out matched lines
 PKG_SECTION:=		utils
+PKG_BUILDDEP:=		pcre
 PKG_URL:=		http://www.gnu.org/software/grep/
 PKG_SITES:=		ftp://ftp.gnu.org/gnu/grep/
+PKG_NOPARALLEL:=	1
 
 include $(TOPDIR)/mk/package.mk