configure: simplify get_version() function

awk alone can do this, no need for grep.
Signed-off-by: Mans Rullgard <mans@mansr.com>

configure

@@ -3774,7 +3774,7 @@ get_version(){
     lcname=$1
     name=$(toupper $lcname)
     file=$source_path/$lcname/version.h
-    eval $(grep "#define ${name}_VERSION_M" "$file" | awk '{ print $2"="$3 }')
+    eval $(awk "/#define ${name}_VERSION_M/ { print \$2 \"=\" \$3 }" "$file")
     eval ${name}_VERSION=\$${name}_VERSION_MAJOR.\$${name}_VERSION_MINOR.\$${name}_VERSION_MICRO
     eval echo "${lcname}_VERSION=\$${name}_VERSION" >> config.mak
     eval echo "${lcname}_VERSION_MAJOR=\$${name}_VERSION_MAJOR" >> config.mak