Don't wrap CC in quotes as our CC has options and this breaks command lookup.

Upstream-Status: Backport [https://git.sdaoden.eu/browse/s-nail.git/commit/?h=next&id=c08f3c898def715edf9164e169c3b3522f4c7a1f]
Signed-off-by: Ross Burton <ross.burton@arm.com>

From c08f3c898def715edf9164e169c3b3522f4c7a1f Mon Sep 17 00:00:00 2001
From: Steffen Nurpmeso <steffen@sdaoden.eu>
Date: Tue, 1 Feb 2022 18:54:16 +0100
Subject: [-] Remove even more bogus quotation marks (Ross Burton)..

On top of (mk/su-find-command.sh: clearly define space behaviour)
and (mx-test.sh: remove bogus quotation marks) Ross Burton
reported some more on the ML.  I looked around and hope this was it.
---
 mk/pcb-cc.sh         | 2 +-
 mk/su-make-errors.sh | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mk/pcb-cc.sh b/mk/pcb-cc.sh
index 2697c5cf..075f8988 100755
--- a/mk/pcb-cc.sh
+++ b/mk/pcb-cc.sh
@@ -18,7 +18,7 @@ if dowemayhave "$@"; then
    if acmd_set CC clang || acmd_set CC gcc ||
          acmd_set CC tcc || acmd_set CC pcc ||
          acmd_set CC c89 || acmd_set CC c99; then
-      exec "$CC" "$@"
+      exec $CC "$@"
    else
       echo >&2 'boing booom tschak'
       echo >&2 'ERROR: I cannot find a compiler!'
diff --git a/mk/su-make-errors.sh b/mk/su-make-errors.sh
index f5c5144e..7fede15e 100644
--- a/mk/su-make-errors.sh
+++ b/mk/su-make-errors.sh
@@ -157,7 +157,7 @@ compile_time() { # {{{
    # The problem is that at least (some versions of) gcc mangle output.
    # Ensure we get both arguments on one line.
    # While here sort numerically.
-   "${CC}" -E "${TARGET}".c |
+   ${CC} -E "${TARGET}".c |
       ${awk} '
          function stripsym(sym){
             sym = substr(sym, 2)
--