rename "src" to "external" (containing git submodules of external dependencies)

.gitmodules

@@ -1,14 +1,14 @@
 [submodule "hash/cpu/src/zikkurat-algebra"]
-	path = hash/cpu/src/zikkurat-algebra
+	path = hash/cpu/external/zikkurat-algebra
 	url = https://github.com/faulhornlabs/zikkurat-algebra
 [submodule "hash/cpu/src/HorizenLabs-poseidon2"]
-	path = hash/cpu/src/HorizenLabs-poseidon2
+	path = hash/cpu/external/HorizenLabs-poseidon2
 	url = https://github.com/HorizenLabs/poseidon2
 [submodule "hash/cpu/src/constantine"]
-	path = hash/cpu/src/constantine
+	path = hash/cpu/external/constantine
 	url = https://github.com/mratsim/constantine/
 [submodule "hash/cpu/src/Blake3"]
-	path = hash/cpu/src/Blake3
+	path = hash/cpu/external/Blake3
 	url = https://github.com/BLAKE3-team/BLAKE3
 [submodule "hash/snark/src/hash-circuits"]
 	path = hash/snark/external/hash-circuits

hash/cpu/bench/Blake3/Unix/build.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 ORIG=`pwd`
-cd ../../../src/Blake3/
+cd ../../../external/Blake3/
 IMPL=`pwd`
 
 cd $IMPL

hash/cpu/bench/Poseidon2/Zikkurat/build.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 echo "build"
 
-ZIK_PATH="../../../src/zikkurat-algebra/"
+ZIK_PATH="../../../external/zikkurat-algebra/"
 
 mkdir -p build
 

hash/cpu/bench/Poseidon2/Zikkurat/poseidon2.c

@@ -23,8 +23,8 @@ gcc -O3 \
 #include <assert.h>
 #include <pthread.h>
 
-#include "../../../src/zikkurat-algebra/lib/cbits/curves/fields/std/bn128_r_std.h"
-#include "../../../src/zikkurat-algebra/lib/cbits/curves/fields/mont/bn128_r_mont.h"
+#include "../../../external/zikkurat-algebra/lib/cbits/curves/fields/std/bn128_r_std.h"
+#include "../../../external/zikkurat-algebra/lib/cbits/curves/fields/mont/bn128_r_mont.h"
 
 #define NLIMBS 4