Remove FHS dependency by replacing /bin/sh with /usr/bin/env sh

examples/mimas2/run.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 set -e
 yosys run_yosys.ys
 edif2ngd example.edif

techlibs/sf2/NOTES.txt

@@ -12,7 +12,7 @@ You'd better to write a simple script, like this one (assuming the top module
 is top):
 
 ----------- run_yosys.sh --------------
-#!/bin/sh
+#!/usr/bin/env sh
 
 set -e
 

tests/various/ezcmdline_dummy_solver

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 # Dummy SAT solver for ezCmdlineSAT tests.
 # Accepts exactly two CNF shapes:
 #  - SAT:   p cnf 1 1; clause: "1 0"  -> exits 10 with v 1