[PATCH] perf tools: Do not require /bin/sh be bash

Commit fcfd6611fbccdbf2593bd949097a5c0e45cd96da truncated .config-detected by piping echo -n to it. On systems where /bin/sh is not bash and echo is a builtin, echo -n prints "-n", which breaks the build: .config-detected:1: *** missing separator. Stop. This broke builds on my Gentoo systems

[PATCH] perf tools: Do not require /bin/sh be bash

Commit fcfd6611fbccdbf2593bd949097a5c0e45cd96da truncated .config-detected by piping echo -n to it. On systems where /bin/sh is not bash and echo is a builtin, echo -n prints -n, which breaks the build: .config-detected:1: *** missing separator. Stop. This broke builds on my Gentoo systems