Upgraded grep to 3.6

Makefile

 all:
-	tar xf grep-3.4.tar.xz
-	cd grep-3.4 && ./configure --build=$(CLFS_TARGET) --prefix=/usr --bindir=/bin
-	$(MAKE) -C grep-3.4
+	tar xf grep-3.6.tar.xz
+	cd grep-3.6 && ./configure --build=$(CLFS_TARGET) --prefix=/usr --bindir=/bin
+	$(MAKE) -C grep-3.6
 	if [[ ! "$(BUILD_OPTIONS)" =~ no-tests ]] ; then \
-	    $(MAKE) -C grep-3.4 check ; \
+	    $(MAKE) -C grep-3.6 check ; \
 	fi
-	$(MAKE) -C grep-3.4 install
-	rm -rf grep-3.4
+	$(MAKE) -C grep-3.6 install
+	rm -rf grep-3.6

build.xml

 <project name="grip">
 
  <target name="temporary-grep">
-  <property name="makedir" value="${builddir}/grep-3.4"/>
+  <property name="makedir" value="${builddir}/grep-3.6"/>
   <exec executable="tar" failonerror="true">
-   <arg line="xf packages/grep/grep-3.4.tar.xz -C ${builddir}"/>
+   <arg line="xf packages/grep/grep-3.6.tar.xz -C ${builddir}"/>
   </exec>
   <exec executable="./configure" dir="${makedir}" failonerror="true">
    <env key="PATH" path="${PATH}"/>