[3.13] gh-131865: Properly apply exported CFLAGS for dtrace/systemtap builds (GH-131866) (#131950)

gh-131865: Properly apply exported CFLAGS for dtrace/systemtap builds (GH-131866)

When using --with-dtrace the resulting object file could be missing
specific CFLAGS exported by the build system due to the systemtap
script using specific defaults.

Exporting the CC and CFLAGS variables before the dtrace invocation
allows us to properly apply CFLAGS exported by the build system
even when cross-compiling.

The fix does not affect the dtrace invocation on Solaris/macOS.
(cherry picked from commit 0cd4befb02df07c0b320cd6246227c13e57b2efb)

Co-authored-by: stratakis <cstratak@redhat.com>