Removes needless call to bash.

* src/Makefile.am: Specifies /bin/sh as shell, used for egrep and fgrep wrappers. 
#* src/egrep.sh Stops adding the working directory in PATH if a ./grep exists 

Closes: #762427, #762917

Index: grep/src/Makefile.am
===================================================================
--- grep.orig/src/Makefile.am
+++ grep/src/Makefile.am
@@ -15,6 +15,7 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 LN = ln
+SHELL = /bin/sh
 
 AM_CFLAGS = $(WARN_CFLAGS) $(WERROR_CFLAGS) $(PCRE_CFLAGS)