DAHDI Linux: Fix compilation with newer RHEL 9 versions. (#52)

Slipstream unmerged PR to fix compilation on RHEL >= 9.3.

phreaknet.sh

@@ -1877,6 +1877,7 @@ install_dahdi() {
 	git_custom_patch "https://patch-diff.githubusercontent.com/raw/asterisk/dahdi-linux/pull/62.diff" # PR 62: Rename MAX to MAX_ATTEMPTS to avoid macro redefinition
 	git_custom_patch "https://patch-diff.githubusercontent.com/raw/asterisk/dahdi-linux/pull/64.diff" # PR 64: More struct device to const struct device
 	git_custom_patch "https://patch-diff.githubusercontent.com/raw/asterisk/dahdi-linux/pull/66.diff" # PR 66: Add braces around empty if body
+	git_custom_patch "https://patch-diff.githubusercontent.com/raw/asterisk/dahdi-linux/pull/69.diff" # PR 69: DEFINE_SEMAPHORE for RHEL
 
 	KERN_VER_MM=$( uname -r | cut -d. -f1-2 )
 	OS_DIST_2=$( printf "$OS_DIST_INFO" | cut -d' ' -f1-2)