unix: use ROOT variable consistently

Fixing up some inconsistencies between scripts.

Author: indygreg

cpython-unix/build-inputproto.sh

@@ -5,7 +5,7 @@
 
 set -ex
 
-cd /build
+ROOT=`pwd`
 
 pkg-config --version
 
@@ -21,4 +21,4 @@ CFLAGS="-fPIC" ./configure \
     --prefix=/tools/deps
 
 make -j `nproc`
-make -j `nproc` install DESTDIR=/build/out
+make -j `nproc` install DESTDIR=${ROOT}/out

cpython-unix/build-kbproto.sh

@@ -5,7 +5,7 @@
 
 set -ex
 
-cd /build
+ROOT=`pwd`
 
 pkg-config --version
 
@@ -21,4 +21,4 @@ CFLAGS="-fPIC" ./configure \
     --prefix=/tools/deps
 
 make -j `nproc`
-make -j `nproc` install DESTDIR=/build/out
+make -j `nproc` install DESTDIR=${ROOT}/out

cpython-unix/build-libX11.sh

@@ -5,7 +5,7 @@
 
 set -ex
 
-cd /build
+ROOT=`pwd`
 
 export PATH=/tools/${TOOLCHAIN}/bin:/tools/host/bin:$PATH
 export PKG_CONFIG_PATH=/tools/deps/share/pkgconfig:/tools/deps/lib/pkgconfig
@@ -48,4 +48,4 @@ CFLAGS="-fPIC -I/tools/deps/include" ./configure \
     ${EXTRA_FLAGS}
 
 make -j `nproc`
-make -j `nproc` install DESTDIR=/build/out
+make -j `nproc` install DESTDIR=${ROOT}/out

cpython-unix/build-libXau.sh

@@ -5,7 +5,7 @@
 
 set -ex
 
-cd /build
+ROOT=`pwd`
 
 export PATH=/tools/${TOOLCHAIN}/bin:/tools/host/bin:$PATH
 export PKG_CONFIG_PATH=/tools/deps/share/pkgconfig:/tools/deps/lib/pkgconfig
@@ -24,4 +24,4 @@ CFLAGS="-fPIC" ./configure \
     ${EXTRA_FLAGS}
 
 make -j `nproc`
-make -j `nproc` install DESTDIR=/build/out
+make -j `nproc` install DESTDIR=${ROOT}/out

cpython-unix/build-libpthread-stubs.sh

@@ -5,7 +5,7 @@
 
 set -ex
 
-cd /build
+ROOT=`pwd`
 
 pkg-config --version
 
@@ -21,4 +21,4 @@ CFLAGS="-fPIC" ./configure \
     --prefix=/tools/deps
 
 make -j `nproc`
-make -j `nproc` install DESTDIR=/build/out
+make -j `nproc` install DESTDIR=${ROOT}/out

cpython-unix/build-libressl.sh

@@ -5,7 +5,7 @@
 
 set -ex
 
-cd /build
+ROOT=`pwd`
 
 export PATH=/tools/${TOOLCHAIN}/bin:/tools/host/bin:$PATH
 
@@ -21,4 +21,4 @@ CFLAGS="${EXTRA_TARGET_CFLAGS} -fPIC" CPPFLAGS="${EXTRA_TARGET_CFLAGS} -fPIC" ./
     --disable-shared
 
 make -j `nproc`
-make -j `nproc` install DESTDIR=/build/out
+make -j `nproc` install DESTDIR=${ROOT}/out

cpython-unix/build-libxcb.sh

@@ -5,7 +5,7 @@
 
 set -ex
 
-cd /build
+ROOT=`pwd`
 
 export PATH=/tools/${TOOLCHAIN}/bin:/tools/host/bin:$PATH
 export PKG_CONFIG_PATH=/tools/deps/share/pkgconfig:/tools/deps/lib/pkgconfig
@@ -24,4 +24,4 @@ CFLAGS="-fPIC" ./configure \
     ${EXTRA_FLAGS}
 
 make -j `nproc`
-make -j `nproc` install DESTDIR=/build/out
+make -j `nproc` install DESTDIR=${ROOT}/out

cpython-unix/build-readline.sh

@@ -5,7 +5,7 @@
 
 set -ex
 
-cd /build
+ROOT=`pwd`
 
 export PATH=/tools/${TOOLCHAIN}/bin:/tools/host/bin:$PATH
 
@@ -22,4 +22,4 @@ CLFAGS="${EXTRA_TARGET_CFLAGS} -fPIC" CPPFLAGS="${EXTRA_TARGET_CFLAGS} -fPIC" LD
         --with-curses
 
 make -j `nproc`
-make -j `nproc` install DESTDIR=/build/out
+make -j `nproc` install DESTDIR=${ROOT}/out

cpython-unix/build-x11-util-macros.sh

@@ -5,7 +5,7 @@
 
 set -ex
 
-cd /build
+ROOT=`pwd`
 
 export PATH=/tools/${TOOLCHAIN}/bin:/tools/host/bin:$PATH
 
@@ -17,4 +17,4 @@ pushd util-macros-${X11_UTIL_MACROS_VERSION}
     --prefix=/tools/deps
 
 make -j `nproc`
-make -j `nproc` install DESTDIR=/build/out
+make -j `nproc` install DESTDIR=${ROOT}/out

cpython-unix/build-xcb-proto.sh

@@ -5,7 +5,7 @@
 
 set -ex
 
-cd /build
+ROOT=`pwd`
 
 pkg-config --version
 
@@ -21,4 +21,4 @@ CFLAGS="-fPIC" ./configure \
     --prefix=/tools/deps
 
 make -j `nproc`
-make -j `nproc` install DESTDIR=/build/out
+make -j `nproc` install DESTDIR=${ROOT}/out