Move parallel build check higher in GCC dockerfile so the output is e…

…asier to find in the logs

deps/gcc.Dockerfile

@@ -29,6 +29,13 @@ ENV INSTALLDIR="$BASEDIR/install"
 ENV STAGINGDIR="$BASEDIR/staging"
 ENV PARALLEL_BUILD="$PARALLEL_BUILD"
 
+# Choose parallel build or not.  Parallel builds are hanging under qemu on
+# GitHub, so we serialize building there.  If parallel builds are disabled,
+# replace nproc so it always says "1".
+RUN echo "nproc = $(nproc)"
+RUN echo "PARALLEL_BUILD = $PARALLEL_BUILD"
+RUN if [[ "$PARALLEL_BUILD" == 0 ]]; then echo -e "#!/bin/sh\necho 1" > $(which nproc); fi
+
 RUN mkdir -p "$SRCDIR"
 RUN mkdir -p "$BUILDDIR"
 RUN mkdir -p "$INSTALLDIR"
@@ -44,13 +51,6 @@ RUN wget ftp://sourceware.org/pub/newlib/${NEWLIB}.tar.gz  -O - | tar -xz
 
 RUN apk add --no-cache bash build-base zlib-dev
 
-# Choose parallel build or not.  Parallel builds are hanging under qemu on
-# GitHub, so we serialize building there.  If parallel builds are disabled,
-# replace nproc so it always says "1".
-RUN echo "nproc = $(nproc)"
-RUN echo "PARALLEL_BUILD = $PARALLEL_BUILD"
-RUN if [[ "$PARALLEL_BUILD" == 0 ]]; then echo -e "#!/bin/sh\necho 1" > $(which nproc); fi
-
 #################################################################################
 ##########################    Building binutils    ##############################
 #################################################################################