build scripts: add quotes around some paths (#7949)

* Update make_libsecp256k1.sh

Avoid error when parent folder has spaces `./make_libsecp256k1.sh: line 31: cd: too many arguments`

* Avoid error when parent folder has spaces, fix for make_libsecp256k1.sh, make_zbar.sh and make_libusb.sh

Co-authored-by: ghost43 <somber.night@protonmail.com>

contrib/make_libsecp256k1.sh

@@ -20,7 +20,7 @@ set -e
 
 . $(dirname "$0")/build_tools_util.sh || (echo "Could not source build_tools_util.sh" && exit 1)
 
-here=$(dirname $(realpath "$0" 2> /dev/null || grealpath "$0"))
+here="$(dirname "$(realpath "$0" 2> /dev/null || grealpath "$0")")"
 CONTRIB="$here"
 PROJECT_ROOT="$CONTRIB/.."
 
@@ -28,7 +28,7 @@ pkgname="secp256k1"
 info "Building $pkgname..."
 
 (
-    cd $CONTRIB
+    cd "$CONTRIB"
     if [ ! -d secp256k1 ]; then
         git clone https://github.com/bitcoin-core/secp256k1.git
     fi

contrib/make_libusb.sh

@@ -7,7 +7,7 @@ set -e
 
 . $(dirname "$0")/build_tools_util.sh || (echo "Could not source build_tools_util.sh" && exit 1)
 
-here=$(dirname $(realpath "$0" 2> /dev/null || grealpath "$0"))
+here="$(dirname "$(realpath "$0" 2> /dev/null || grealpath "$0")")"
 CONTRIB="$here"
 PROJECT_ROOT="$CONTRIB/.."
 
@@ -15,7 +15,7 @@ pkgname="libusb"
 info "Building $pkgname..."
 
 (
-    cd $CONTRIB
+    cd "$CONTRIB"
     if [ ! -d libusb ]; then
         git clone https://github.com/libusb/libusb.git
     fi

contrib/make_zbar.sh

@@ -16,7 +16,7 @@ set -e
 
 . $(dirname "$0")/build_tools_util.sh || (echo "Could not source build_tools_util.sh" && exit 1)
 
-here=$(dirname $(realpath "$0" 2> /dev/null || grealpath "$0"))
+here="$(dirname "$(realpath "$0" 2> /dev/null || grealpath "$0")")"
 CONTRIB="$here"
 PROJECT_ROOT="$CONTRIB/.."
 
@@ -24,7 +24,7 @@ pkgname="zbar"
 info "Building $pkgname..."
 
 (
-    cd $CONTRIB
+    cd "$CONTRIB"
     if [ ! -d zbar ]; then
         git clone https://github.com/mchehab/zbar.git
     fi