Make the c and ac scripts work with sh and without bin in PATH

bin/c

Index: bin/c
diff --git a/bin/c b/bin/c
index 129a4e142bb8184887f5fe322b41716927415644..6e3bd6e1853e604cc1e32dfbd5aa05037cca09da 100755
--- a/bin/c
+++ b/bin/c
@@ -6,7 +6,7 @@ BRANCH=$(git branch | grep \* | cut -d" "  -f 2)
 CLEAN=${CLEAN-clean}
 SAMPLES=100
 
-if [ $BRANCH == $CLEAN ]; then
+if [ "$BRANCH" = "$CLEAN" ]; then
     echo "Comparing $BRANCH to itself."
     exit 1
 fi
@@ -23,4 +23,4 @@ git checkout $BRANCH
 ninja -C out/Release nanobench
 out/Release/nanobench $@ --samples $SAMPLES -v 2> $BRANCH.log
 
-compare $CLEAN.log $BRANCH.log
+./bin/compare $CLEAN.log $BRANCH.log