Get jenkins_build.sh to use make -j instead of make -j4

jenkins_build.sh

@@ -146,9 +146,9 @@ case "$build" in
   UNIX)
         echo ./configure  --prefix=$PWD/usr  $withcurl $withssh
              ./configure "--prefix=$PWD/usr" $withcurl $withssh
-        make -j4 "LDFLAGS=-L${PWD}/usr/lib -L${PWD}/xmpsdk/src/.libs"
+        make -j "LDFLAGS=-L${PWD}/usr/lib -L${PWD}/xmpsdk/src/.libs"
         make install
-        make -j4 samples "CXXFLAGS=-I${PWD}/usr/include -I${PWD}/src" "LDFLAGS=-L${PWD}/usr/lib -L${PWD}/xmpsdk/src/.libs -lexiv2"
+        make -j samples "CXXFLAGS=-I${PWD}/usr/include -I${PWD}/src" "LDFLAGS=-L${PWD}/usr/lib -L${PWD}/xmpsdk/src/.libs -lexiv2"
         result=$?
         run_tests
         "$PWD/usr/bin/exiv2" -v -V
@@ -167,9 +167,9 @@ case "$build" in
 			rm   -rf config.log config.status
 			echo ./configure ${withcurl} ${withssh} --disable-nls
 				 ./configure ${withcurl} ${withssh} --disable-nls
-			make -j4
+			make -j
 			make install
-			make -j4 samples
+			make -j samples
 			run_tests
 			/usr/local/bin/exiv2 -v -V
 			result=$?
@@ -215,7 +215,7 @@ case "$build" in
             fi
 
             ./configure $withcurl $withssh
-            make        # DO NOT USE -j4.  It seems to hang the build!
+            make        # DO NOT USE -j.  It seems to hang the build!
             make install
             make samples
             run_tests